3,4-dihydro-2H-pyrazino[1,2-A]indol-1-one derivatives active as kinase inhibitors, process for their preparation and pharmaceutical compositions comprising them

Abstract

compounds which are 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one derivatives or pharmaceutically acceptable salts thereof, their preparation process and pharmaceutical compositions comprising them are disclosed; these compounds are useful in the treatment of diseases caused by and/or associated with an altered protein kinase activity such as cancer, viral infection, prevention of AIDS development in HIV-infected individuals, cell proliferative disorders, autoimmune and neurodegenerative disorders; also disclosed is a process under Solid Phase Synthesis conditions for preparing the compounds of the invention and chemical libraries comprising a plurality of them.

Description

The present invention relates to certain 8-amino derivatives of 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one compounds, which modulate the activity of protein kinases. The compounds of this invention are therefore useful in treating diseases caused by dysregulated protein kinase activity. The present invention also relates to methods for preparing these compounds, combinatorial libraries thereof, pharmaceutical compositions comprising these compounds, and methods of treating diseases utilizing pharmaceutical compositions comprising these compounds.

The malfunctioning of protein kinases (PKs) is the hallmark of numerous diseases. A large share of the oncogenes and proto-oncogenes involved in human cancers code for PKs. The enhanced activities of PKs are also implicated in many non-malignant diseases, such as benign prostate hyperplasia, familial adenomatosis, polyposis, neuro-fibromatosis, psoriasis, vascular smooth cell proliferation associated with atherosclerosis, pulmonary fibrosis, arthritis, glomerulonephritis and post-surgical stenosis and restenosis.

PKs are also implicated in inflammatory conditions and in the multiplication of viruses and parasites. PKs may also play a major role in the pathogenesis and development of neurodegenerative disorders.

For a general reference to PKs malfunctioning or disregulation see, for instance, Current Opinion in Chemical Biology 1999, 3, 459-465 and Carcinogenesis 2008, 29, 1087-191.

3,4-Dihydro-2H-pyrazino[1,2-a]indol-1-one derivatives for the treatment of disorders of the central nervous system and obesity are disclosed in WO 2002/010169 and WO 2002/072584, all in the name of F. Hoffmann-La Roche A.-G. and Vernalis Research (Limited).

8-Oxy derivatives of 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one for the treatment of obesity are disclosed in WO2007/065820 in the name of F. Hoffmann-La Roche A.-G.

7-Carmaboyl-derivatives of 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one for the treatment of cytokine mediated diseases such as rheumatoid arthritis, inflammatory bowel disease and Alzheimer's disease are disclosed in US200627453, in the name of Boehringer Ingelheim Pharmaceuticals, Inc., USA.

The present inventors have now discovered that the new compounds of formula (I), described below, are kinase inhibitors and are thus useful in therapy as antitumor agents.

Accordingly, a first object of the present invention is to provide a 8-amino-3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one compound represented by formula (I):

##STR00001##
wherein
R is selected from the group consisting of —R^a, —COR^a, —CONR^aR^b, —SO₂R^a and —COOR^a, and
R1 is a group —NR^cR^d or —OR^c,
wherein R^a, R^b, R^c and R^d, the same or different, are each independently hydrogen or a group optionally further substituted, selected from straight or branched C₁-C₆ alkyl, C₂-C₆ alkenyl or C₂-C₆ alkynyl, C₃-C₆ cycloalkyl or cycloalkyl C₁-C₆ alkyl, heterocyclyl or heterocyclyl C₁-C₆ alkyl, aryl or aryl C₁-C₆ alkyl, heteroaryl or heteroaryl C₁-C₆ alkyl or, taken together with the nitrogen atom to which they are bonded, either R^a and R^b as well as R^c and R^d may form an optionally substituted 3 to 7 membered heterocyclyl or heteroaryl, optionally containing one additional heteroatom or heteroatomic group selected from S, O, N or NH,
and pharmaceutically acceptable salts thereof.

The present invention also provides methods of synthesizing the substituted 8-amino-3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one compounds, represented by formula (I), prepared through a process consisting of standard synthetic transformations.

The present invention also provides a method for treating diseases caused by and/or associated with dysregulated protein kinase activity, particularly PLK family, ABL, AKT1, ALK, AUR1, AUR2, BRK, CDC7/DBF4, CDK2/CYCA, CHK1, CK2, EE2FK, EGFR1, ERK2, FAK, FGFR1, FLT3, GSK3beta, IGFR1, IKK2, IR, JAK2, JAK3, KIT, LCK, MAPKAPK2, MET, MPS1, NEK6, NIM1, P38alpha, PAK4, PDGFR, PDK1, PERK, PIM1, PKAalpha, PKCbeta, PLK1, RET, B-RAF, STLK2, SULU1, TRKA, VEGFR2, VEGFR3, ZAP70.

A preferred method of the present invention is to treat a disease caused by and/or associated with dysregulated protein kinase activity selected from the group consisting of cancer, viral infection, prevention of AIDS development in HIV-infected individuals, cell proliferative disorders, autoimmune and neurodegenerative disorders.

Another preferred method of the present invention is to treat specific types of cancer including but not limited to: carcinoma such as bladder, breast, colon, kidney, liver, lung, including small cell lung cancer, esophagus, gall-bladder, ovary, pancreas, stomach, cervix, thyroid, prostate, and skin, including squamous cell carcinoma; hematopoietic tumors of lymphoid lineage including leukaemia, acute lymphocytic leukaemia, acute lymphoblastic leukaemia, B-cell lymphoma, T-cell-lymphoma, Hodgkin's lymphoma, non-Hodgkin's lymphoma, hairy cell lymphoma and Burkitt's lymphoma; hematopoietic tumors of myeloid lineage, including acute and chronic myelogenous leukemias, myelodysplastic syndrome and promyelocytic leukaemia; tumors of mesenchymal origin, including fibrosarcoma and rhabdomyosarcoma; tumors of the central and peripheral nervous system, including astrocytoma, neuroblastoma, glioma and schwannomas; other tumors, including mesothelioma, melanoma, seminoma, teratocarcinoma, osteosarcoma, xeroderma pigmentosum, keratoxanthoma, thyroid follicular cancer and Kaposi's sarcoma.

Another preferred method of the present invention is to treat specific cellular proliferation disorders such as, for example, benign prostate hyperplasia, familial adenomatosis polyposis, neurofibromatosis, psoriasis, vascular smooth cell proliferation associated with atherosclerosis, pulmonary fibrosis, arthritis, glomerulonephritis and post-surgical stenosis and restenosis.

In addition, the method of the present invention also provides tumor angiogenesis and metastasis inhibition, as well as treatment of organ transplant rejection and host versus graft disease.

In a further preferred embodiment, the method of the present invention further comprises subjecting the mammal in need thereof to a radiation therapy or chemotherapy regimen in combination with at least one cytostatic or cytotoxic agent. Moreover the invention provides an in vitro method for inhibiting protein kinase activity which comprises contacting the said protein kinase with an effective amount of a compound of formula (I).

The present invention also provides a pharmaceutical composition comprising one or more compounds of formula (I) or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable excipient, carrier or diluent.

The present invention also provides a pharmaceutical composition comprising a compound of formula (I) in combination with known cytostatic or cytotoxic agents, antibiotic-type agents, DNA damaging or intercalating agents, platin-based agents, alkylating agents, antimetabolite agents, hormonal agents, antihormonal agents such as antiestrogens, antiandrogens and aromatase inhibitors, immunological agents, interferon-type agents, cyclooxygenase inhibitors (e.g. COX-2 inhibitors), matrixmetalloprotease inhibitors, tyrosine kinase inhibitors, other kinase inhibitors, anti-growth factor receptor agents, anti-HER agents, anti-EGFR agents, anti-angiogenesis agents (e.g. angiogenesis inhibitors), farnesyl transferase inhibitors, ras-raf signal transduction pathway inhibitors, cell cycle inhibitors, other cdks inhibitors, tubulin binding agents, topoisomerase I inhibitors, topoisomerase II inhibitors, inhibitors of kinesins, therapeutic monoclonal antibodies, inhibitors of mTOR, histone deacetylase inhibitors, inhibitors of hypoxic response and the like.

Additionally, the invention provides a product or kit comprising a compound of formula (I) or a pharmaceutically acceptable salt thereof, as defined above, or pharmaceutical compositions thereof and one or more chemotherapeutic agents, as a combined preparation for simultaneous, separate or sequential use in anticancer therapy.

In yet another aspect the invention provides a compound of formula (I) or a pharmaceutically acceptable salt thereof, as defined above, for use as a medicament. Moreover the invention provides the use of a compound of formula (I) or a pharmaceutically acceptable salt thereof, as defined above, in the manufacture of a medicament for treating diseases caused by and/or associated with an altered protein kinase activity.

Finally, the invention provides a compound of formula (I) or a pharmaceutically acceptable salt thereof, as defined above, for use in a method for treating diseases caused by and/or associated with an altered protein kinase activity.

Unless otherwise specified, when referring to the compounds of formula (I) per se as well as to any pharmaceutical composition thereof or to any therapeutic method of treatment comprising them, the present invention includes all the solvates, hydrates, complexes, metabolites, prodrugs, carriers, N-oxides and pharmaceutically acceptable salts of the compounds of this invention.

“Solvate” means a physical association of a compound of this invention with one or more solvent molecules. This physical association involves varying degrees of ionic and covalent bonding, including hydrogen bonding. In certain instances the solvate will be capable of isolation, for example when one or more solvent molecules are incorporated in the crystal lattice of the crystalline solid. “Solvate” encompasses both solution-phase and isolatable solvates. Non-limiting examples of suitable solvates include ethanolates, methanolates, and the like.

“Hydrate” is a solvate wherein the solvent molecule is H₂O.

A “metabolite” of a compound of formula (I) is any compound into which this same compound of formula (I) is converted in vivo, for instance upon administration to a mammal in need thereof. Typically, without however representing a limiting example, upon administration of a compound of formula (I), this same derivative may be converted into a variety of compounds, for instance including more soluble derivatives like hydroxylated derivatives, which are easily excreted. Hence, depending upon the metabolic pathway thus occurring, any of these hydroxylated derivatives may be regarded as a metabolite of the compounds of formula (I).

The term “prodrug”, as employed herein, denotes a compound that is a drug precursor, which, upon administration to a subject, undergoes chemical conversion by metabolic or chemical processes to yield a compound of formula (I) or a salt and/or solvate thereof A discussion of prodrugs is provided in T. Higuchi and V. Stella, Pro-drugs as Novel Delivery Systems (1987) Volume 14 of the A.C.S. Symposium Series, and in Bioreversible Carriers in Drug Design, (1987) Edward B. Roche, ed., American Pharmaceutical Association and Pergamon Press.

All forms of chiral isomers or other forms of isomers including enantiomers and diastereomers, are intended to be covered herein. Compounds containing a chiral center may be used as a racemic mixture or as an enantiomerically enriched mixture, or the racemic mixture may be separated using well-known techniques and an individual enantiomer may be used alone.

In cases wherein compounds may exist in tautomeric forms, such as keto-enol tautomers, each tautomeric form is contemplated as being included within this invention whether existing in equilibrium or predominantly in one form.

In the present description, unless otherwise indicated, with the term “straight or branched C₁-C₆ alkyl” we intend any group such as, for instance, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, and the like. With the term “straight or branched C₂-C₆ alkenyl” or “straight or branched C₂-C₆ alkynyl” we intend any of the unsaturated alkenyl or alkynyl groups with from 2 to 6 carbon atoms for instance including vinyl, allyl, 1-propenyl, isopropenyl, 1-, 2- or 3-butenyl, pentenyl, hexenyl, ethynyl, 1- or 2-propynyl, butyryl, pentynyl, hexynyl, and the like.

With the term “C₃-C₆ cycloalkyl” we intend, unless otherwise specified, 3- to 6-membered all-carbon monocyclic ring, which may contain one or more double bonds but does not have a completely conjugated π-electron system. Examples of cycloalkyl groups, without limitation, are cyclopropane, cyclobutane, cyclopentane, cyclopentene, cyclohexane, cyclohexene and cyclohexadiene.

With the term “heterocyclyl” we intend a 3- to 7-membered, saturated or partially unsaturated carbocyclic ring where one or more carbon atoms are replaced by heteroatoms such as nitrogen, oxygen and sulfur. Non limiting examples of heterocyclyl groups are, for instance, pyrane, pyrrolidine, pyrroline, imidazoline, imidazolidine, pyrazolidine, pyrazoline, thiazoline, thiazolidine, dihydrofuran, tetrahydrofuran, 1,3-dioxolane, piperidine, piperazine, morpholine and the like.

With the term “aryl” we intend a mono-, bi- or poly-carbocyclic hydrocarbon with from 1 to 4 ring systems, optionally further fused or linked to each other by single bonds, wherein at least one of the carbocyclic rings is “aromatic”, wherein the term “aromatic” refers to completely conjugated π-electron bond system. Non limiting examples of such aryl groups are phenyl, α- or β-naphthyl or biphenyl groups.

With the term “heteroaryl” we intend aromatic heterocyclic rings, typically 5- to 7-membered heterocycles with from 1 to 3 heteroatoms selected among N, O or S; the heteroaryl ring can be optionally further fused or linked to aromatic and non-aromatic carbocyclic and heterocyclic rings. Not limiting examples of such heteroaryl groups are, for instance, pyridyl, pyrazinyl, pyrimidinyl, pyridazinyl, indolyl, imidazolyl, thiazolyl, isothiazolyl, pyrrolyl, phenyl-pyrrolyl, furyl, phenyl-furyl, oxazolyl, isoxazolyl, pyrazolyl, thienyl, benzothienyl, isoindolinyl, benzoimidazolyl, quinolinyl, isoquinolinyl, 1,2,3-triazolyl, 1-phenyl-1,2,3-triazolyl, 2,3-dihydroindolyl, 2,3-dihydrobenzo furanyl, 2,3-dihydrobenzothiophenyl; benzopyranyl, 2,3-dihydrobenzoxazinyl, 2,3-dihydroquinoxalinyl and the like.

According to the meanings provided to R^a, R^b, R^c and R^d, any of the above groups may be further optionally substituted in any of their free positions by one or more groups, for instance 1 to 6 groups, selected from: halogen, nitro, oxo groups (═O), carboxy, cyano, C₁-C₆ alkyl, polyfluorinated alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, cycloalkyl, cycloalkenyl, heterocyclyl, aryl, heteroaryl; amino groups and derivatives thereof such as, for instance, alkylamino, dialkylamino, arylamino, diarylamino, ureido, alkylureido or arylureido; carbonylamino groups and derivatives thereof such as, for instance, formylamino, alkylcarbonylamino, alkenylcarbonylamino, arylcarbonylamino, alkoxycarbonylamino; hydroxy groups and derivatives thereof such as, for instance, alkoxy, polyfluorinated alkoxy, aryloxy, alkylcarbonyloxy, arylcarbonyloxy, cycloalkenyloxy or alkylideneaminoxy; carbonyl groups and derivatives thereof such as, for instance, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, cycloalkyloxycarbonyl, aminocarbonyl, alkylaminocarbonyl, dialkylaminocarbonyl; sulfurated derivatives such as, for instance, alkylthio, arylthio, alkylsulfonyl, arylsulfonyl, alkylsulfinyl, arylsulfinyl, arylsulfonyloxy, amino sulfonyl, alkylaminosulfonyl or dialkylaminosulfonyl.

In their turn, whenever appropriate, each of the above substituents may be further substituted by one or more of the aforementioned groups.

In the present description, unless otherwise specified, with the term “cyano” we intend a —CN residue.

With the term “nitro” we intend a —NO₂ group.

With the term “halogen” we intend a fluorine, chlorine, bromine or iodine atom.

With the term “polyfluorinated alkyl or alkoxy” we intend a straight or branched C₁-C₆ alkyl or alkoxy group as above defined, wherein more than one hydrogen atom is replaced by fluorine atoms such as, for instance, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethyl, 2,2,2-trifluoroethoxy, 1,2-difluoroethyl, 1,1,1,3,3,3-hexafluoropropyl-2-yl, and the like.

From all of the above, it is clear to the skilled man that any group which name has been identified as a composite name such as, for instance, cycloalkylalkyl, arylalkyl, heterocyclylalkyl, alkoxy, alkylthio, aryloxy, arylalkyloxy, alkylcarbonyloxy and the like, has to be intended as conventionally construed from the parts to which it derives. So far, as an example, the terms heterocyclyl-alkyl and cycloalkyl-alkyl stand for a straight or branched alkyl group being further substituted by a heterocyclic or cycloalkyl group, respectively, as above defined.

The term “pharmaceutically acceptable salts” embraces salts commonly used to form alkali metal salts and to form addition salts of free acids or free bases. The nature of the salt is not critical, provided that it is pharmaceutically acceptable. Suitable pharmaceutically acceptable acid addition salts of the compounds of the present invention may be prepared from an inorganic acid or from an organic acid. Examples of such inorganic acids are hydrochloric, hydrobromic, hydroiodic, nitric, carbonic, sulfuric, and phosphoric acid. Appropriate organic acids may be selected from aliphatic, cycloaliphatic, aromatic, araliphatic, heterocyclic, carboxylic and sulfonic classes of organic acids, examples of which are formic, acetic, trifluoroacetic, propionic, succinic, glycolic, gluconic, lactic, malic, fumaric, tartaric, citric, ascorbic, glucuronic, maleic, fumaric, pyruvic, aspartic, glutamic, benzoic, anthranilic, mesylic, salicylic, p-hydroxybenzoic, phenylacetic, mandelic, embonic (pamoic), methanesulfonic, ethanesulfonic, benzenesulfonic, pantothenic, toluenesulfonic, 2-hydroxyethanesulfonic, sulfanilic, stearic, cyclohexylaminosulfonic, algenic, hydroxybutyric, galactaric and galacturonic acid. Suitable pharmaceutically acceptable base addition salts of the compounds of the present invention include metallic salts made from aluminum, calcium, lithium, magnesium, potassium, sodium and zinc or organic salts made from N,N′-dibenzylethylenediamine, chloroprocaine, choline, diethanolamine, ethylenediamine, meglumine (N-methyl-glucamine) and procaine. All of these salts may be prepared by conventional means from the corresponding compounds of the present invention, for instance by reacting them with the appropriate acid or base.

A preferred class of compounds of formula (I) are the compounds wherein:

R1 is a group —NR^cR^d and R^c and R^d are both hydrogen atoms or one of them is a hydrogen atom and the remaining one of R^c or R^d is a straight or branched C₁-C₆ alkyl or C₂-C₆ alkenyl group or it is an optionally substituted aryl or arylalkyl group.

Another preferred class of compounds of formula (I) are the compounds wherein:

R is a group R^a wherein R^a is hydrogen, or is a group —SO₂R^a wherein R^a is straight or branched C₁-C₆ alkyl or optionally substituted aryl or arylalkyl.

A further preferred class of compounds of formula (I) are the compounds wherein:

R is a group —COR^a wherein R^a is a straight or branched C₁-C₆ alkyl, cycloalkyl or optionally substituted aryl or arylalkyl group.

A more preferred class of compounds of formula (I) are the compounds wherein:

R is a group —CONR^aR^b wherein one of R^a and R^b are hydrogen and the other is straight or branched C₁-C₆ alkyl, optionally substituted aryl or arylalkyl group.

For a reference to any specific compound of formula (I) of the invention, optionally in the form of pharmaceutically acceptable salts, see the experimental section.

The intermediate compound of formula (VII):

##STR00002##
wherein R1 is as defined above, is novel and hence represents a further object of the invention.

The present invention also provides a process for the preparation of a compound of formula (I) as defined above, characterized in that the process comprises:

a) hydrolysing under basic or acidic conditions the compound of formula (II):

##STR00003##
b) reacting the resultant compound of formula (III) or a salt thereof:

##STR00004##
with 2,2-dimethoxy-ethylamine, after activation of the carboxyl group;
c) deprotecting under acidic conditions the resultant compound of formula (IV):

##STR00005##
d) reacting under basic conditions the resultant compound of formula (V):

##STR00006##
with a phosphonate of formula (VI):

##STR00007##
wherein Alk is C₁-C₆ alkyl and R^c is C₁-C₆ alkyl;
optionally converting the resultant compound of formula (VII):

##STR00008##
wherein R1 represents OR^c and R^c is C₁-C₆ alkyl, into another compound of formula (VII) by replacing the —OR^c group with a different group among those represented by R1;
e) reducing said compound of formula (VII) to give a compound of formula (I) or a salt thereof:

##STR00009##
wherein R1 is OR^c and R^c is C₁-C₆ alkyl;
optionally separating the resultant compound of formula (I) into the single isomers; converting the resultant compound of formula (I) into a different compound of formula (I) by derivatising the amino moiety, and/or by replacing the group —OR^c with a different group among those represented by R1, and/or into a pharmaceutically acceptable salt if desired.

The present invention further provides a process for the preparation of a compound of formula (I) as defined above, characterized in that the compound of formula (I) prepared in steps from a) to e) described above, is converted into another compound of formula (I) by derivatising the amino moiety, said derivatization being carried out by one or more of the following reactions:

f) reacting a compound of formula (I) wherein R is hydrogen and R1 is —OR^c and R^c is C₁-C₆ alkyl, according to any one of the alternative steps:

f.1) with an acid or an acyl halide of formula (VIII):
R^aCOZ  (VIII)
wherein R^a is as defined above and Z is a halogen or a group —OH, to give a compound of formula (I):

##STR00010##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl and R^a are as defined above; or
f.2) with an isocyanate of formula (IX):
R^aNCO  (IX)
wherein R^a is as defined above, to give a compound of formula (I):

##STR00011##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl and R^a are as defined above; or
f.3) with a sulphonyl halide of formula (X):
R^aSO₂Z′  (X)
wherein R^a is as defined above and Z′ is a halogen, to give a compound of formula (I):

##STR00012##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl and R^a are as defined above; or
f.4) with a halogen carbonate of formula (XI):
R^aOCOZ′  (XI)
wherein R^a and Z′ are as defined above, to give a compound of formula (I):

##STR00013##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl and R^a are as defined above; or
f.5) with an amine of formula (XII):
HNR^aR^b  (XII)
wherein R^a and R^b are as defined above, in presence of a suitable chloroformate, to give a compound of formula (I):

##STR00014##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, and R^a and R^b are as defined above; or
(f.6) with a suitable aldehyde or ketone derivative of formula (XIII):
R^a—CO—R^a  (XIII)
wherein each of R^a, the same or different, are as defined above, to give a compound of formula (I):

##STR00015##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl and each of R^a, the same or different, are as defined above; or
(f.7) with an halide of formula (XIV):
R^a—Z′  (XIV)
wherein R^a and Z′ are as defined above, to give a compound of formula (I):

##STR00016##
wherein R1 is —OR^c and R^c is C₁-C₆ alkyl and R^a are as defined above;
optionally separating the resultant compound of formula (I) into the single isomers; converting the resultant compound of formula (I) into a different compound of formula (I) by replacing the group —OR^c with a different group among those represented by R1, and/or into a pharmaceutically acceptable salt if desired.

The present invention further provides a process for the preparation of a compound of formula (I) as defined above, characterized in that the compound of formula (I) is converted into another compound of formula (I), said conversion is carried out by one or more of the following reactions:

g.1) acid or basic hydrolysis of a compound of formula (I) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, to give the corresponding compound of formula (I) wherein R1 is —OR^c and R^c is hydrogen, or the corresponding salt;

g.2) transesterification of a compound of formula (I) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, by reactions with a compound of formula (XV):
R^c—OH  (XV)
to give the corresponding compound of formula (I) wherein R1 is —OR^c and R^c is a different C₁-C₆ alkyl;
g.3) aminolysis of a compound of formula (I) wherein R₁ is —OR^c and R^c is C₁-C₆ alkyl, by reaction with a compound of formula (XVI):
HNR^cR^d  (XVI)
to give the corresponding compound of formula (I) wherein R1 is —NR^cR^d;
g.4) esterification of a compound of formula (I) wherein R1 is a group —OH or its corresponding salt, by reactions with a compound of formula (XV) as defined above, to give the corresponding compound of formula (I) wherein R1 is —OR^c;
g.5) amidation of a compound of formula (I) wherein R1 is a group —OH or its corresponding salt, by reaction with a compound of formula (XVI) as defined above, to give the corresponding compound of formula (I) wherein R1 is —NR^cR^d.

The present invention further provides a process for the preparation of a compound of formula (I) as defined above, characterized in that the compound of formula (VII) as defined above, is converted into another compound of formula (VII), said conversions are carried out by one or more of the following reactions:

h.1) acid or basic hydrolysis of a compound of formula (VII) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, to give a compound of formula (VII) wherein R1 is —OR^c and R^c is hydrogen, or the corresponding salt;

h.2) transesterification of a compound of formula (VII) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, by reaction with a compound of formula (XV) as defined above, to give a compound of formula (VII) wherein R1 is —OR^c and R^c is a different C₁-C₆ alkyl;

h.3) amidation of a compound of formula (VII) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, by reaction with a compound of formula (XVI) as defined above, to give a compound of formula (VII) wherein R1 is —NR^cR^d;

h.4) esterification of a compound of formula (VII) wherein R1 is —OR^c and R^c is hydrogen, or the corresponding salt, by reaction with a compound of formula (XV) as defined above, to give a compound of formula (VII) wherein R1 is —OR^c and R^c is different from hydrogen;
h.5) amidation of a compound of formula (VII) wherein R1 is —OR^c and R^c is hydrogen, by reaction with a compound of formula (XVI) as defined above, to give a compound of formula (VII) wherein R1 is —NR^cR^d.

From all of the above, it is clear to the skilled person that if a compound of formula (I) or (VII), prepared according to the above processes comprehensive of any variant thereof, is obtained as an admixture of isomers, their separation into the single isomers of formula (I), carried out according to conventional techniques, is still within the scope of the present invention.

Likewise, the conversion of a compound of formula (I) into a pharmaceutically acceptable salt thereof or, alternatively, the conversion into the free compound (I) of a corresponding salt, according to procedures well-known in the art, is still within the scope of the invention.

When preparing the compounds of formula (I) according to any variant of the process, which are all to be intended as within the scope of the invention, optional functional groups within the starting materials, the reagents or the intermediates thereof, and which could give rise to unwanted side reactions, need to be properly protected according to conventional techniques.

The starting materials of the process object of the present invention, comprehensive of any possible variant, as well as any reactant thereof, are known compounds and if not commercially available per se may be prepared according to well-known methods. Likewise, the compounds of formula (II), (VI), (VIII), (IX), (X), (XI), (XII), (XIII), (XIV), (XV), (XVI), are known or easily obtained according to known methods, for a general reference see: Smith, Michael—March's Advanced Organic Chemistry: reactions mechanisms and structure—5^th Edition, Michael B. Smith and Jerry March, John Wiley & Sons Inc., New York (NY), 2001.

According to step (a) of the process, the hydrolysis of the compound of formula (II) under basic or acidic conditions can be carried out in a variety of ways, according to conventional methods for hydrolysing esters derivatives. Preferably, the reaction is carried out in the presence of aqueous lithium hydroxide, methanol and tetrahydrofuran, at a temperature ranging from room temperature to about 90° C. and for a time from 4 hours to one day. According to the operative conditions being employed, the compound of formula (III) could be obtained either in its acidic form or, alternatively, as a salt.

According to step (b) of the process, the conversion of the compound of formula (III) into the corresponding amido derivative of formula (IV), can be carried out in a variety of ways, according to conventional methods for obtaining amido derivatives from the corresponding acids. For example the reaction may be carried out by reaction with 2,2-dimethoxy-ethylamine after activation of the carboxylic function of the compound of formula (III) by reaction with thionyl chloride, oxalyl chloride or alternatively in the presence of a suitable condensing agent, for instance dicyclohexylcarbodiimide (DCC), 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide (EDC), O-benzotriazolyl-tetramethyl-isouronium tetrafluoroborate (TBTU) or benzotriazol-1-yloxy-tripyrrolidino-phosphonium hexafluorophosphate (PyBOP). Preferably, the reaction is carried out using thionyl chloride in dioxane as solvent and the isolated acyl chloride, by volatiles removal, is reacted with 2,2-dimethoxy-ethylamine under well-known Schotten-Baumann conditions.

According to step (c) of the process, the deprotection of the di-methyl acetal of the compound of formula (IV) can be carried out in a variety of ways, according to conventional methods for acetal removal. Preferably, the reaction is carried out in the presence of a suitable solvent, for instance in acetone and water, under acidic conditions, for instance in the presence of a mineral acid, preferably hydrochloric acid.

According to step (d) of the process, the reaction of the compound of formula (V) with compound of formula (VI) can be carried out in a variety of ways, according to conventional methods for Horner-Emmons reaction. Preferably, the reaction is carried out using different organic or inorganic bases such as lithium hydroxide in tetrahydrofuran and water or 1,8-diazabicyclo[5.4.0]undec-7-ene in acetonitrile with the trimethyl phosphonoacetate of formula (VI).

According to step (e) of the process, the reduction of the nitro group of the compound of formula (VII) to give a compound of formula (I), can be carried out in a variety of ways, according to conventional methods for reducing nitro group to the corresponding amino derivative. Preferably the reaction is carried out in the presence of tin (II) chloride in dimethylformamide (DMF) at room temperature for a time ranging from 4 to 24 hours.

According to any one of steps (f.1) to (f.7) the preparation of functionalized amino derivatives starting from the corresponding amine can be carried out in a variety of ways, according to conventional methods.

Preferably, according to step (f.1), (f.3) and (f.4) of the process, the compound of formula (I) is dissolved in a suitable solvent such as dichloromethane, dimethylformamide, tetrahydrofuran, dioxane or the like, and a suitable base such as triethylamine, diisopropylethylamine or sodium carbonate is added therein.

The compounds of general formula (VIII), (X) or (XI) are then added and the mixture stirred for a time of about 2 hours to about 15 hours, at a temperature ranging from about 20° C. to about 80° C. A suitable catalyst such as dimethylamino pyridine may be optionally used.

Preferably according to step (f.2) of the process, the reaction conditions are the same as above reported for steps (f.1), (f.3) and (f.4) except that the base may not be required.

The compound of general formula (IX) is then added and the mixture stirred as reported above for steps (f.1), (f.3) and (f.4).

Preferably according to step (f.5) of the process, the compound of formula (I) is reacted with an amino derivative of formula (XII) after activation by reaction with a suitable chloroformate such as, for instance, 4-nitrophenylchloroformate. The reaction is carried out in a suitable solvent such as a halogenated hydrocarbon, preferably dichloromethane, in the presence of a base such as, for instance, diisopropylethylamine or triethylamine and by working at room temperature.

Preferably according to step (f.6) of the process, the compound of formula (I) is with reacted with an aldehyde or ketone derivative of formula (XIII). It is clear to the skilled man that by employing an aldehyde derivative of formula (XIII) wherein one of the two R^a is a hydrogen atom, the corresponding derivatives wherein R is —CH₂R^a are obtained. Likewise, by employing a ketone derivative, compounds having R as —CH(R^a)R^a are obtained, wherein each R^a is, independently from each other, as set forth above but other than hydrogen. The reaction can be carried out in a variety of ways, according to conventional methods for reductive amination. Preferably, the reaction is carried out by reaction with an aldehyde or ketone derivative of formula (XIII) in a suitable solvent such as tetrahydrofuran and after a time from 2 to 12 hours by addition of a reducing agent such as sodium cyanoborohydride or sodium triacetoxyborohydride.

Preferably according to step (f.7) of the process, the compound of formula (I) is reacted with an aromatic iodide or bromide of formula (XIV) in the presence of a suitable catalyst, for instance a palladium catalyst like palladium acetate or Pd₂(dba)₃, and of a suitable ligand. See, for a general reference to the above arylation reaction and operative conditions thereof also inclusive of solvents, catalysts and ligands, J. Am. Chem. Soc., (2003), 125, 6653-55; JOC (2001), 66, 2560-2565; and JOC (2002), 67, 6479-6486.

According to any one of steps (g.1) to (g.5) the conversion of a compound of formula (I) into another compound of formula (I) can be carried out in a variety of ways, according to conventional methods.

Preferably according to step (g.1) of the process, the hydrolysys of a compound of formula (I) wherein R1 is —OCH₃, to give the corresponding compound of formula (I) wherein R1 is —OH is carried out under acidic or basic conditions. Preferably, the reaction is carried out as described under step (a). According to the operative conditions being employed, the compound of formula (I) wherein R1 is —OH could be obtained either in its acidic form or, alternatively, as a salt.

Preferably according to step (g.2) of the process, the transesterification of a compound of formula (I) wherein R1 is —OCH₃, to give the corresponding compound of formula (I) wherein R1 is —OR^c and R^c is an alkyl different from methyl, is carried out by reaction with a compound of formula (XV) in an appropriate solvent, such as the compound of formula (XV) itself or dioxane at the refluxing temperature, optionally in the presence of a suitable metal based catalysts, like dibutylin oxide or titanium alkoxides such as, for instance, titanium (IV) ethoxide, titanium (IV) isopropoxide and the like.

Preferably according to step (g.3) of the process, the aminolysis of a compound of formula (I) wherein R1 is —OCH₃, to give the corresponding compound of formula (I) wherein R1 is —NR^cR^d, is carried out in an appropriate solvent such as dioxane or dichloromethane optionally in the presence of a suitable metal based catalysts, like trimethyl aluminium.

Preferably according to step (g.4) of the process, the esterification of a compound of formula (I) wherein R1 is a group —OH to give the corresponding compound of formula (I) wherein R1 is —OR^c, is carried out in the presence of a suitable condensing agent, for instance dicyclohexylcarbodiimide (DCC), 1-ethyl-3-(3′-dimethylaminopropyl)-carbodiimide (EDC), O-benzotriazolyltetramethylisouronium tetrafluoroborate (TBTU) or benzotriazol-1-yloxytripyrrolidinophosphonium hexafluorophosphate (PyBOP), in an appropriate solvent such as dichloromethane, dimethylformamide.

Preferably according to step (g.5) of the process, the amidation of a compound of formula (I) wherein R1 is a group —OH to give the corresponding compound of formula (I) wherein R1 is —NR^cR^d can be carried out in a variety of ways, according to conventional methods for obtaining amido derivatives from the corresponding acids.

Preferably, the reaction is carried out by reaction with compound of formula (XVI) after activation of the carboxylic function of the compound of formula (I) by reaction with thionyl chloride, oxalyl chloride or alternatively in the presence of a suitable condensing agent, for instance dicyclohexylcarbodiimide (DCC), 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide (EDC), O-benzotriazolyltetramethylisouronium tetrafluoroborate (TBTU) or benzotriazol-1-yloxytripyrrolidinophosphonium hexafluorophosphate (PyBOP), in an appropriate solvent such as dichloromethane, and/or dimethylformamide.

According to any one of steps (h.1) to (h.5) the conversion of a compound of formula (VII) into another compound of formula (VII) can be carried out in a variety of ways, according to conventional methods.

Preferably it is carried out as described under the steps from (g.1) to (g.5).

In addition to the above, the compounds of formula (I) may be advantageously prepared according to combinatorial chemistry techniques widely known in the art, by accomplishing the aforementioned reactions between the intermediates in a serial manner and by working under solid-phase-synthesis (SPS) conditions.

As an example, the intermediate carboxy ester derivatives of formula (VII), wherein R1 represents OR^c and R^a is C₁-C₆ alkyl, being obtained in step (d) of the above processes, can be first converted into the free carboxy acid derivative by means of hydrolysis carried out according to conventional methods, then easily supported onto a polymeric resin, for instance through the formation of a carboxamido group.

The intermediate thus supported may be subsequently reacted according to the remaining steps of the process.

The above synthetic pathway can be summarized as follows:

##STR00017##

Any of the above reactions is carried out according to known methods, by working as formerly reported, and allows to obtain compounds of formula (I) as set forth above.

Preferably, the above resin is a commercially available polystyrenic resin including, for instance, Wang resin, Trityl resin, Cl-trityl resin, Rink amide resin, Tentagel OH resin and derivatives thereof.

According to a preferred embodiment of the invention, the polystyrenic resin is a derivatized formyl polystyrenic resin which may be obtained by reacting a commercially available formyl polystyrenic resin, e.g. 4-(4-formyl-3-methoxyphenoxy)butyryl AM resin, with a suitable amino derivative under reductive conditions, for instance in the presence of sodium triacetoxyborohydride and derivatives thereof, substantially as follows:

##STR00018##

The reaction may be carried out in a suitable solvent such as tetrahydrofuran and in the presence of acetic acid.

The polymer-supported-amino derivatives thus obtained, particularly those, which are referable to as derivatized formyl polystyrenic resin above, are widely known in the art. In general, amines loaded onto formylpolystyrenic resins also known as Acid Sensitive MethoxyBenzaldehyde polystirene resins (AMEBA resin) are prepared by standard reductive amination in the presence of an excess of amine in TMOF/DCE and NaBH(OAc)₃ or AcOH/DMF and NaCNBH₃, for instance as reported in Tetrahedron Letters (1997), 38, 7151-7154; J. Am. Chem. Soc. (1998), 120, 5441; and Chem. Eur. J. (1999), 5, 2787.

Therefore, it is a further object of the present invention a process for preparing the compounds of formula (I), and the pharmaceutically acceptable salts thereof, which process comprises:

i) hydrolyzing under acid or basic conditions the compound of formula (VII) wherein R1 represents OR^c and R^c is C₁-C₆ alkyl;

j) reacting the resultant acid derivative with a derivatized formyl polystyrenic resin of formula (XVII):
(P)—CH₂—NHR^c  (XVII)
wherein (P) is the resin and R^c is as defined above;
k) reacting of the resultant compound of formula (XVIII):

##STR00019##
wherein (P) and R^c are as described above, with a suitable reducing agent such as chromium (II) chloride, tetrabutylammonium hydrogen sulfide or tin (II) chloride;
and
l) reacting the resultant compound of formula (XIX):

##STR00020##
wherein (P) and R^c are as described above, as described under any one of steps from (f.1) to (f.7);
m) cleaving the resin under acidic conditions from the resultant compound of formula (XX):

##STR00021##
to give a compound of formula (I), wherein R is as defined above and R1 is —NHR^c, wherein R^c is as defined above, optionally separating the resultant compound of formula (I) into the single isomers; converting the resultant compound of formula (I) into a different compound of formula (I) and/or into a pharmaceutically acceptable salt if desired.

According to step (i) of the process, the hydrolysis of a compound of formula (VII) wherein R₁ is —OCH₃, to give the corresponding compound of formula (VII) wherein R1 is —OH is carried out as described under step (h.1).

According to step (j) of the process, the reaction with the polystyrene resin is performed in a suitable solvent, for instance NMP, in the presence of diisopropylethylamine (DIPEA) and of a suitable condensing agent such as, for instance, 1-ethyl-3-(3′-dimethylaminopropyl)carbodiimide (EDC) or O-benzotriazolyl tetramethylisouronium tetrafluoroborate (TBTU).

According to step (k) of the process, the supported compound of formula (XVIII) is reduced to obtain the corresponding amino derivative; the reaction is carried out in the presence of tin (II) chloride in dimethylformamide (DMF) at room temperature for a time ranging from 4 to 24 hours.

According to step (l), the supported compound of formula (XIX) is optionally further reacted to give to a variety of compounds functionalised in position 5 of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one ring, as described under any one of steps from (f.1) to (f.7).

According to step (m), the cleavage of the resin is performed under acidic conditions in the presence of suitable acids such as, for instance, hydrochloric, trifluoroacetic, methanesulfonic or p-toluensulfonic acid. Preferably the reaction is carried out using trifluoroacetic acid in dichloromethane as solvent.

Clearly, by working according to combinatorial chemistry techniques as formerly indicated, a plurality of compounds of formula (I) may be obtained.

Hence, it is a further object of the present invention a library of two or more compounds of formula (I)

##STR00022##
wherein
R is selected from the group consisting of —R^a, —COR^a, —CONR^aR^b, —SO₂R^a and —COOR^a, and R1 is a group —NR^cR^d or —OR^c, wherein R^a, R^b, R^c and R^d, the same or different, are each independently hydrogen or a group optionally further substituted, selected from straight or branched C₁-C₆ alkyl, C₂-C₆ alkenyl or C₂-C₆ alkynyl, C₃-C₆ cycloalkyl or cycloalkyl C₁-C₆ alkyl, heterocyclyl or heterocyclyl C₁-C₆ alkyl, aryl or aryl C₁-C₆ alkyl, heteroaryl or heteroaryl C₁-C₆ alkyl or, taken together with the nitrogen atom to which they are bonded, either R^a and R^b as well as R^c and R^d may form an optionally substituted 3 to 7 membered heterocyclyl or heteroaryl, optionally containing one additional heteroatom or heteroatomic group selected from S, O, N or NH, and pharmaceutically acceptable salts thereof.

According to a preferred embodiment of the invention, the aforementioned library comprises the compounds of formula (I) wherein R₁ is a group —NR^cR^d and R^c and R^d are both hydrogen atoms or one of them is a hydrogen atom and the remaining one of R^c or R^d is a straight or branched C₁-C₆ alkyl or C₂-C₆ alkenyl group or it is an optionally substituted aryl or arylalkyl group.

Also preferred is a library of compounds of formula (I) wherein R is either a group R^a with R^a as a hydrogen atom or a group —SO₂R^a with R^a as a straight or branched C₁-C₆ alkyl group or optionally substituted aryl or arylalkyl group; and R₁ is as above defined.

Also preferred is a library of compounds of formula (I) wherein R is a group —COR^a with R^a as a straight or branched C₁-C₆ alkyl, cycloalkyl or optionally substituted aryl or arylalkyl group.

Also preferred is a library of compounds of formula (I) wherein R is a group-CONR^aR^b with one of R^a and R^b as a hydrogen atom and the other of R^a and R^b as a straight or branched C₁-C₆ alkyl, optionally substituted aryl or arylalkyl group.

For a general reference to the above libraries of compounds of formula (I) see the experimental section.

From all of the above, it is clear to the skilled person that once a library of 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one derivatives is thus prepared, for instance consisting of a few thousands of compounds of formula (I), the said library can be very advantageously used for screening towards given kinases, as formerly reported.

See, for a general reference to libraries of compounds and uses thereof as tools for screening biological activities, J. Med. Chem. 1999, 42, 2373-2382; and Bioorg. Med. Chem. Lett. 10 (2000), 223-226.

PHARMACOLOGY

The inhibiting activity of putative kinase inhibitors and the potency of selected compounds is determined through a method of assay based on the use of the Kinase-Glo® Luminescent Kinase Assay (commercially available from Promega corporation and described in Koresawa, M. and Okabe, T. (2004) High-throughput screening with quantitation of ATP consumption: A universal non-radioisotope, homogeneous assay for protein kinase. Assay Drug Dev. Technol. 2, 153-60).

The depletion of ATP as a result of kinase activity can be monitored in a highly sensitive manner through the use of Kinase-Glo® or Kinase-Glo® Plus Reagent, which uses luciferin, oxygen and ATP as substrates in a reaction that produces oxyluciferin and light.

The short forms and abbreviations used herein have the following meaning:

BSA   bovine serum albumine
Tris  2-Amino-2-(hydroxymethyl)-1,3-propanediol
Hepes N-(2-Hydroxyethyl)piperazine-N′-
      (2-ethanesulfonic acid)
DTT   threo-1,4-Dimercapto-2,3-butanediol
THF   tetrahydrofurane
MTBE  methyl tertiary butyl ether
DIPEA diisopropylethylamine
PyBOP benzotriazol-1-yloxytris(pyrrolidino)
      phosphonium exafluorophosphate
TFA   trifluoroacetic acid
TMOF  trimethyl orto formate
DCE   dichloroethane
DCM   dichloromethane
DMF   dimethylformammide
DMSO  dimethylsulfoxide
KDa   kiloDalton
mg    milligram
μg    microgram
ng    nanogram
L     liter
mL    milliliter
μL    microliter
M     molar
mM    millimolar
μM    micromolar
nM    nanomolar

Kinase reaction conditions are target (enzyme) dependent and thus undergo individual adaptations. The Kinase-Glo® Luminescent Kinase Assay can be used with virtually any kinase and substrate combination.

Also the buffer conditions may vary depending on the kinase of interest (e.g. for PKA a composition of 40 mM Tris pH 7.5, 20 mM MgCl2, 0.1 mg/ml BSA, in 50 μl final volume is used). Typically the range of ATP titration is 0.1 μM to 10 μM.

The optimal kinase substrate results in the greatest change in luminescence when comparing kinase reaction wells with no kinase wells.

The optimal amount of kinase is determined by making two fold serial dilutions across plates using the optimal amount of ATP and optimal kinase substrate. The optimal amount of kinase to use in subsequent compound screens and IC50 determinations is the amount required for luminescence to be within the linear range of the kinase titration curve (sigmoidal dose response).

Robotized Kinase-Glo® Assay

This assay was set up for the measurement of kinase activity and/or inhibition. It is homogeneous, suitable for all type of protein kinases, quick and radioactivity-free.

We established the assay in 384 well-plates: the test mix consisted of:

1) 3× Enzyme mix (done in Kinase Buffer 3×), 5 μl/well

2) 3× substrate and ATP mix (done in ddH2O), 5 μl/well

3) 3× compound of formula (I) (diluted into ddH2O—3% DMSO)—5 μl/well)

As an outcome, the percentage of inhibition at 10 μM was evaluated for each compound tested: see below for compound dilution and assay scheme. Each enzyme had its own buffer constitution, substrate type and concentration. Incubation time instead was 90 min for all targets.

Test compounds were received as a 1 mM solution in 100% DMSO into 96 well plates. The plates were diluted to 30 μM in ddH₂O, 3% DMSO; 4 plates are reorganized in 384 well plate by dispensing 5 μl of each 96wp into the four quadrants of a 384wp. In well P23 and P24 the internal standard inhibitor staurosporine was added.

Assay Scheme

Test plates were first added with 5 μL of the compound dilution (30 μM, corresponding to 3× dilution) and then loaded onto a robotized station together with one reservoir for the Enzyme mix (3×) and one for the ATP mix (3×), specific for each target under study.

To start the assay, the robot aspirated 5 μL of ATP/Substrate mix, made an air gap inside the tips (5 μl) and aspirated 5 μl of Enzyme mix. The subsequent dispensation into the test plates allowed the kinase reaction to start after 3 cycles of mixing, done by the robot itself by up and down pipetting. At this point, the correct concentration was restored for all reagents.

The robot incubated the plates for 90 minutes at room temperature, and then stopped the reaction by pipetting 15 μl of Kinase-Glo® reagent into the reaction mix. Three cycles of mixing were done immediately after the addition of the reagent.

The principle of the Kinase-Glo® technique is the presence in the reagent mixture of oxygen, luciferin and luciferase enzyme: in the presence of ATP, remaining from the kinase reaction, oxi-luciferin is produced with the emission of light, directly dependent on the amount of ATP. For optimal performances of this technique, the kinase reaction should utilize at least 15-20% of the available ATP.

After another 60 minutes of incubation to stabilize the luminescent signal, the plates were read on a ViewLux® instrument. Data were analyzed using the software package Assay Explorer® that provided percent inhibition data.

As example herein are reported the assay conditions used for testing the compounds of formula (I) against ALKtide YFF APCo kinase;

ATP concentration: 1 μM

Enzyme concentration: 100 nM

Reaction buffer: Hepes 50 mM pH 7.5, MgCl2 5 mM, MnCl2 1 mM, DTT 1 mM, NaOVO3 3 uM, 0.2 mg/ml BSA

Assay procedure: add 5 ul compound of formula (I) (3×), add 5 μl ATP/S mix (3×) in buffer1x; add 5 μl enzyme in buffer 2x+3×BSA; for the blank, add 5 μl buffer2x+3×BSA without enzyme. After 90 minutes of incubation, add 15 μl/well of Kinase-Glo reagent. After 60-90 minutes of incubation to stabilize the luminescent signal, the plates are read on a ViuwLux instrument.

Some representative compounds of the invention of formula (I), such as compound A23-M-B63, A23-M-B55 and A20-M-B14 (for the meanings of the codes, see the Examples section), at a dosage of 10 μM have been found to have a % inhibition >25% when tested in the method described above.

So far, the novel compounds of the invention are unexpectedly endowed with a kinase inhibitory activity against a selected panel of kinases, and are thus particularly advantageous, in therapy, against proliferative disorders associated with an altered kinase activity.

The compounds of the present invention can be administered either as single agents or, alternatively, in combination with known anticancer treatments such as radiation therapy or chemotherapy regimen in combination with cytostatic or cytotoxic agents, antibiotic-type agents, alkylating agents, antimetabolite agents, hormonal agents, immunological agents, interferon-type agents, cyclooxygenase inhibitors (e.g. COX-2 inhibitors), matrixmetalloprotease inhibitors, telomerase inhibitors, tyrosine kinase inhibitors, anti-growth factor receptor agents, anti-HER agents, anti-EGFR agents, anti-angiogenesis agents (e.g. angiogenesis inhibitors), farnesyl transferase inhibitors, ras-raf signal transduction pathway inhibitors, cell cycle inhibitors, other cdks inhibitors, tubulin binding agents, topoisomerase I inhibitors, topoisomerase II inhibitors, and the like.

If formulated as a fixed dose, such combination products employ the compounds of this invention within the dosage range described below and the other pharmaceutically active agent within the approved dosage range.

Compounds of formula (I) may be used sequentially with known anticancer agents when a combination formulation is inappropriate.

The compounds of formula (I) of the present invention, suitable for administration to a mammal, e.g., to humans, can be administered by the usual routes and the dosage level depends upon the age, weight, conditions of the patient and administration route.

For example, a suitable dosage adopted for oral administration of a compound of formula (I) may range from about 10 to about 500 mg per dose, from 1 to 5 times daily. The compounds of the invention can be administered in a variety of dosage forms, e.g., orally, in the form tablets, capsules, sugar or film coated tablets, liquid solutions or suspensions; rectally in the form suppositories; parenterally, e.g., intramuscularly, or through intravenous and/or intrathecal and/or intraspinal injection or infusion.

The present invention also includes pharmaceutical compositions comprising a compound of formula (I) or a pharmaceutically acceptable salt thereof in association with a pharmaceutically acceptable excipient, which may be a carrier or a diluent.

The pharmaceutical compositions containing the compounds of the invention are usually prepared following conventional methods and are administered in a suitable pharmaceutical form. For example, the solid oral forms may contain, together with the active compound, diluents, e.g., lactose, dextrose saccharose, sucrose, cellulose, corn starch or potato starch; lubricants, e.g., silica, talc, stearic acid, magnesium or calcium stearate, and/or polyethylene glycols; binding agents, e.g., starches, arabic gum, gelatine methylcellulose, carboxymethylcellulose or polyvinyl pyrrolidone; disintegrating agents, e.g., starch, alginic acid, alginates or sodium starch glycolate; effervescing mixtures; dyestuffs; sweeteners; wetting agents such as lecithin, polysorbates, laurylsulphates; and, in general, non-toxic and pharmacologically inactive substances used in pharmaceutical formulations. These pharmaceutical preparations may be manufactured in known manner, for example, by means of mixing, granulating, tabletting, sugar-coating, or film-coating processes.

The liquid dispersions for oral administration may be, e.g., syrups, emulsions and suspensions. As an example, the syrups may contain, as carrier, saccharose or saccharose with glycerine and/or mannitol and sorbitol.

The suspensions and the emulsions may contain, as examples of carriers, natural gum, agar, sodium alginate, pectin, methylcellulose, carboxymethylcellulose, or polyvinyl alcohol. The suspension or solutions for intramuscular injections may contain, together with the active compound, a pharmaceutically acceptable carrier, e.g., sterile water, olive oil, ethyl oleate, glycols, e.g., propylene glycol and, if desired, a suitable amount of lidocaine hydrochloride.

The solutions for intravenous injections or infusions may contain, as a carrier, sterile water or preferably they may be in the form of sterile, aqueous, isotonic, saline solutions or they may contain propylene glycol as a carrier.

The suppositories may contain, together with the active compound, a pharmaceutically acceptable carrier, e.g., cocoa butter, polyethylene glycol, a polyoxyethylene sorbitan fatty acid ester surfactant or lecithin.

With the aim of better illustrating the present invention, without posing any limitation to it, the following examples are now given.

EXPERIMENTAL SECTION

General Methods

Flash Chromatography was performed on silica gel (Merck grade 9395, 60A). The high-pressure liquid chromatography retention times (HPLC: r.t. values) were determined by:

HPLC Method 1A and 1B:

A Waters Alliance LC mod. 2795 equipped with a variable UV detector mod 2487, a Chemiluminescence Nitrogen detector (CLND, Antek 8060) and a Waters ZQ2000 mass detector (ESI interface) was used in this application. The total flow was splitted and distributed to the three detectors at a fixed ratio (64:15:21 UV:MS:CLND). The liquid chromatograph was equipped with a 30×3.0 mm I.D. column (Waters×Bridge C18, 3.5 um particles), thermostated at 50° C. Two mobile phases were used: phase A was 0.05% w/v formic acid (1 mL/L of 50% formic acid Fluka 09676 in highly purified water) and phase B was 70/25/5 (v/v/v) MeOH/iPrOH/H2O containing 0.035% w/v of formic acid (700 uL/L of 50% formic acid Fluka 09676).

A 5 μL volume of 1 mM nominal sample solution in DMSO was injected (sequential, partial loop mode with no air gaps) and a generic reversed phase gradient analysis was carried out at 0.8 mL/min into either a fast variant (method 1A) or a slower one (method 1B), as indicated in the following table:

Method 1A	Method 1B
tR (min)	phase B (%)	tR (min)	phase B (%)
0.00	0	0.00	0
5.00	100	8.00	100
5.70	100	9.00	100
5.71	0	9.01	0
6.3	stop time	9.6	stop time
7.9	total analysis time (*)	11.2	total analysis time (*)
(*) between consecutive injections

The UV detector was operated at 220 nm, 5 Hz sampling rate. The MS device was operated at 3.2 kV capillary voltage, 30 V cone, 2 V extractor, 0.5 V RF lens, 400 L/hr desolvation flow, 100 L/hr cone flow, 100° C. source temperature, 150° C. desolvation temperature, ESI(+) full scan 120-1200 amu acquisition, at 1.7 Hz sampling rate. The CLND detector was operated at 1050° C. furnace temp, 280 mL/min inlet oxygen flow, 80 mL/min inlet argon, 25 mL/min make-up argon, 30 mL/min ozone, 28 ton vacuum, 750 V PMT voltage, PMT chamber at +10° C., sensitivity high, select 5, 4 Hz sampling rate.

HPLC Method 2:

Instrumentation: Waters 2790 HPLC system equipped with a 996 Waters PDA detector and Micromass mod. ZQ 2000 single quadrupole mass spectrometer, equipped with an electrospray (ESI) ion source.

Chromatographic condition: Waters×Terra RP18 (4.6×50 mm, 3.5 μm) column; Mobile phase A was ammonium acetate 5 mM buffer (pH 5.2 with acetic acid)/acetonitrile 95:5, and Mobile phase B was H₂O/acetonitrile (5:95). Gradient from 10 to 90% B in 8 minutes, hold 100% B for 2 minutes. PDA channels extracted at 220 nm and 254 nm. Flow rate 1 ml/min. Injection volume 10 μl. Full scan, mass range from 100 to 800 amu. Capillary voltage was 3.5 kV; source temp. was 120° C.; cone was 14 V. Retention times (HPLC r.t.) are given in minutes at 220 nm or at 254 nm. Mass is given as m/z ratio.

When necessary, the compounds have been purified by preparative HPLC on a Waters X-Bridge Prep Shield RP18 (19×100 mm, 5 μm) column or a Phenomenex Gemini C18 (21.2×250 mm, 10 μm) column, using a Waters FractionLynx Autopurification System equipped with a 996 Waters PDA detector and a Micromass mod. ZQ single quadrupole mass spectrometer, electron spray ionization, positive mode. Mobile phase A was water 0.05% NH3/acetonitrile 95:5, and Mobile phase B was acetonitrile. Gradient from 10 to 90% B in 8 min or 15 min. Flow rate 20 ml/min.

¹H-NMR spectrometry was performed on a Bruker AVANCE 400 MHz single bay instrument with gradients. It is equipped with a QNP probe (interchangeable 4 nuclei probe—¹H, 13C, 19F and 31P) (NMR method 1) or on a Mercury VX 400 operating at 400.45 MHz equipped with a 5 mm double resonance probe [1H (15N-31P) ID_PFG Varian] (NMR method 2).

The compounds of formula (I), having an asymmetric carbon atom and obtained as racemic mixture, were resolved by HPLC separation on chiral columns. In particular, for example, preparative columns CHIRALPACK® AD, CHIRALPACK® AS, CHIRALCELL® OJ can be used.

As formerly indicated, several compounds of formula (I) of the invention have been synthesized in parallel, according to combinatorial chemistry techniques.

In this respect, some compounds thus prepared have been conveniently and unambiguously identified, as per the coding system of tables III, VI, V and VI together with HPLC retention time (methods 1 and 2) and mass.

Each code, which identifies a single specific compound of formula (I), consists of three units A-M-B.

A represents any substituent R₁-[see formula (I)] and is attached to the rest of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety through the carbon atom of the carbonyl group so as to get 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one derivatives; each A radical (substituent) is represented in the following table I.

B represents any substituent R—[see formula (I)] and is attached to the rest of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety through the nitrogen atom of the NH group so as to get 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one derivatives being substituted in position 8; each B radical (substituent) is represented in the following table II.

M refers to the central core of the divalent 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety being substituted at the carbonyl group by groups A and in position 8 (through the NH group) by groups B, substantially as follows:

##STR00023##

For ease of reference, each A or B groups of tables I and II has been identified with the proper chemical formula also indicating the point of attachment with the rest of the molecule M.

Just as an example, the compound A2-M-B2 of table III (entry 1) represents an 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one M being substituted in position 8 by the group B2 (through the NH group), and by the group A2 through the CO group; likewise, the compound A4-M-09 of table IV (entry 780) represents an 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one M being substituted in position by the group B9 (through the NH group), and by the group A4 through the CO group, as follows:

##STR00024##

TABLE I

A groups
Fragment     CODE

##STR00025## A1

##STR00026## A2

##STR00027## A3

##STR00028## A4

##STR00029## A5

##STR00030## A6

##STR00031## A7

##STR00032## A8

##STR00033## A9

##STR00034## A10

##STR00035## A11

##STR00036## A12

##STR00037## A13

##STR00038## A14

##STR00039## A15

##STR00040## A16

##STR00041## A17

##STR00042## A18

##STR00043## A19

##STR00044## A20

##STR00045## A21

##STR00046## A22

##STR00047## A23

##STR00048## A24

##STR00049## A25

##STR00050## A26

##STR00051## A27

##STR00052## A28

TABLE II

B groups
Fragment     CODE

##STR00053## B1

##STR00054## B2

##STR00055## B3

##STR00056## B4

##STR00057## B5

##STR00058## B6

##STR00059## B7

##STR00060## B8

##STR00061## B9

##STR00062## B10

##STR00063## B11

##STR00064## B12

##STR00065## B13

##STR00066## B14

##STR00067## B15

##STR00068## B16

##STR00069## B17

##STR00070## B18

##STR00071## B19

##STR00072## B20

##STR00073## B21

##STR00074## B22

##STR00075## B23

##STR00076## B24

##STR00077## B25

##STR00078## B26

##STR00079## B27

##STR00080## B28

##STR00081## B29

##STR00082## B30

##STR00083## B31

##STR00084## B32

##STR00085## B33

##STR00086## B34

##STR00087## B35

##STR00088## B36

##STR00089## B37

##STR00090## B38

##STR00091## B39

##STR00092## B40

##STR00093## B41

##STR00094## B42

##STR00095## B43

##STR00096## B44

##STR00097## B45

##STR00098## B46

##STR00099## B47

##STR00100## B48

##STR00101## B49

##STR00102## B50

##STR00103## B51

##STR00104## B52

##STR00105## B53

##STR00106## B54

##STR00107## B55

##STR00108## B56

##STR00109## B57

##STR00110## B58

##STR00111## B59

##STR00112## B60

##STR00113## B61

##STR00114## B62

##STR00115## B63

##STR00116## B64

##STR00117## B65

##STR00118## B66

##STR00119## B67

##STR00120## B68

##STR00121## B69

##STR00122## B70

##STR00123## B71

##STR00124## B72

##STR00125## B73

##STR00126## B74

##STR00127## B75

##STR00128## B76

Preparation of 5-nitro-1H-indole-2-carboxylic acid (III)

LiOH.H2O (1.06 g, 46.2 mmol, 2.1 eq.) was added to a suspension of 5-nitro-1H-indole-2-carboxylic acid ethyl ester (II) (5.15 g, 22 mmol, 1 eq.) in THF/MeOH/H2O 1:1:2 (180 ml). The final suspension turned to dark yellow and was stirred at 25° C. After 30 min the solubilization was complete and total conversion was achieved after 6 hours. The reaction mixture was cooled to 0° C. and quenched with HCl 2N until the solution reached pH 5. Organic volatiles were removed under reduced pressure and the white precipitate was filtered and dried to give the compound of formula (III). Yield=4.53 g (quantitative).

Same procedure on 50 g scale afforded 42.2 g of the compound of formula (III) (96% yield).

LCMS (HPLC Method 2): m/z 205 [M−H]⁻ @ r.t. 2.58 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 2.59 (dd, J=15.91, 5.67 Hz, 1H) 2.82 (dd, J=15.97, 8.29 Hz, 1H) 3.58 (dd, J=12.86, 5.67 Hz, 1H) 3.89 (dd, J=13.35, 4.08 Hz, 1H) 5.17-5.23 (m, 1H) 7.36 (s, 1H) 7.80 (d, J=9.15 Hz, 1H) 8.15 (dd, J=9.15, 2.32 Hz, 1H) 8.27 (d, J=5.12 Hz, 1H) 8.72 (d, J=2.32 Hz, 1H) 12.58 (br. s., 1H).

Preparation of 5-nitro-1H-indole-2-carboxylic acid (2,2-dimethoxy-ethyl)-amide (IV)

Thionyl chloride (8 ml, 110 mmol, 5 eq.) was added to a suspension of the compound of formula (III) (4.53 g, 22 mmol, 1 eq.) in dry dioxane (50 ml). The final suspension was refluxed in dry atmosphere (CaCl2 valve) for 2 h, and the reaction turned to a light brown solution while proceeding. The reaction was cooled to 25° C. and organic volatiles were removed under reduced pressure, then dry toluene (25 ml) was added and removed under vacuum, this operation was repeated twice. The brown residue (22 mmol, 1 eq.) was added portion wise to a cooled solution at 0° C. of NaHCO₃ (3.7 g, 43.95 mmol, 2 eq.) and 2,2-dimethoxy-ethylamine (2.39 ml, 21.97 mmol, 1 eq.) in dioxane/water 4:1 (100 ml), the suspension was stirred for 2 hours at rt. Organic volatiles were removed under reduced pressure and the yellow precipitate was filtered and dried to give 5-nitro-1H-indole-2-carboxylic acid (2,2-dimethoxy-ethyl)-amide (IV). Yield=5.80 g (90%).

Same procedure on 42.2 g scale afforded 52.75 g of a compound of formula (IV) (82% yield).

LCMS (HPLC Method 2): m/z 294 [M+H]⁺ @ r.t. 4.46 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 3.31 (s, 6H) 3.40 (t, J=5.73 Hz, 2H) 4.53 (t, J=5.49 Hz, 1H) 7.43 (d, J=1.46 Hz, 1H) 7.57 (d, J=9.02 Hz, 1H) 8.07 (dd, J=9.02, 2.32 Hz, 1H) 8.70 (d, J=2.32 Hz, 1H) 8.80 (t, J=6.04 Hz, 1H) 12.30 (s, 1H).

Preparation of 4-hydroxy-8-nitro-3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one (V)

HCl 2N (13.75 ml, 27.5 mmol, 2.5 eq.) was added to a solution of the compound of formula (IV) (3 g, 11 mmol, 1 eq.) in acetone (200 ml), the final solution was stirred at 25° C. for 48 h. The solution was dried under reduced pressure affording the compound of formula (V) as yellow solid that was used in the subsequent step without further purification. Same procedure on 30 g scale proceeded smoothly. Typical yield: 97%.

Warning: on higher scale a careful drying step until constant weight is mandatory in order to avoid that residual HCl interferes in the following step.

LCMS (HPLC Method 2): m/z 246 [M−H]⁻ @ r.t. 3.1 min (broad peak).

Preparation of (8-nitro-1-oxo-1,2,3,4-tetrahydro-pyrazino[1,2-a]indol-4-yl)-acetic acid methyl ester (VII)

LiOH*H₂O (509 mg, 12.14 mmol, 1.5 eq.) was added to a solution of trimethyl phosphono acetate (VI) (1.28 ml, 8.90 mmol, 1.2 eq.), to the compound of formula (V) (2.0 g, 8.09 mmol, 1 eq.) and water (4.4 ml, 240 mmol, 30 eq.) in THF (100 ml) and the solution was stirred at 25° C. for 4 hours, then organic volatiles were removed under reduced pressure and the crude residue was used in the next step without further purification, after addition of 100 ml of water.

On higher scale (110 mol) the reaction was worse (low conversion) for the mentioned above residue of HCl.

LCMS (HPLC Method 2): m/z 304 [M+H]⁺ @ r.t. 3.96 min. ¹H NMR (on isolated product) (400 MHz, DMSO-d₆) δ ppm 2.68 (dd, J=15.61, 6.22 Hz, 1H) 2.92 (dd, J=15.49, 7.44 Hz, 1H) 3.51 (s, 3H) 3.58 (ddd, J=13.29, 5.37, 1.10 Hz, 1H) 3.90 (dd, J=13.41, 4.15 Hz, 1H) 5.25 (dt, J=6.83, 3.66 Hz, 1H) 7.36 (s, 1H) 7.75 (d, J=9.15 Hz, 1H) 8.17 (dd, J=9.27, 2.32 Hz, 1H) 8.28 (d, J=5.00 Hz, 1H) 8.72 (d, J=2.20 Hz, 1H).

Preparation of (8-nitro-1-oxo-1,2,3,4-tetrahydro-pyrazino[1,2-a]indol-4-yl)-acetic acid (VII)

LiOH*H₂O (408 mg, 9.72 mmol, 1.2 eq.) was added to aqueous solution of the crude of example 4 and the resultant suspension was stirred at 25° C. for 4 hours. The brown suspension was filtered. The dark brown mother solution was quenched with HCl 2N until pH 5 was reached (yellow precipitate), organic volatiles were removed under reduced pressure and the yellow precipitate was filtered. The crude material was stirred with acetone (20 ml/g of crude) for 12 hours then the undissolved material was filtered and dried under reduced pressure (light yellow solid). Yields: 1.2 g of the acid derivative of formula (VII) (50% over two steps) 89% UV purity @254 nm.

Same procedure on higher scale afforded the compound of formula III with average yields of 35% over two steps and 90% UV purity @254 nm, the main impurity is the starting material of example 4.

LCMS (HPLC Method 2): m/z 288 [M−H]⁻ @ r.t. 2.62 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 2.59 (dd, J=15.91, 5.67 Hz, 1H) 2.82 (dd, J=15.97, 8.29 Hz, 1H) 3.58 (dd, J=12.86, 5.67 Hz, 1H) 3.89 (dd, J=13.35, 4.08 Hz, 1H) 5.17-5.23 (m, 1H) 7.36 (s, 1H) 7.80 (d, J=9.15 Hz, 1H) 8.15 (dd, J=9.15, 2.32 Hz, 1H) 8.27 (d, J=5.12 Hz, 1H) 8.72 (d, J=2.32 Hz, 1H) 12.58 (br. s., 1H).

General Procedure: Loading of Allylamine (Corresponding to Fragment A7 of Table I) onto Acid Sensitive Methoxy Benzaldehyde Polystyrene Resin (AMEBA II Resin).

4-(4-formyl-3-methoxyphenoxy)butyryl aminomethyl resin (copolystyrene-1% DVB) (6.0 g, 5.88 mmol, 0.98 mmol/g, 1 eq.) was suspended in dry THF (60 ml) and allylamine (29.4 mmol, 5 eq.) was added. The resultant suspension was shaken at 25° C. for 2 h. Then acetic acid (1.68 ml, 29.4 mmol, 5 eq.) and NaBH(AcO)₃ (3.12 g, 14.7 mmol, 3 eq.) were added and the final suspension was shaken for 16 h at 25° C. The resin was rinsed with THF (2 cycles), MeOH (2 cycles), DCM (2 cycles), MeOH (2 cycles), DMF (2 cycles) and DCM (3 cycles) then dried in nitrogen flux.

Loading of the 3,4-dihydro-2h-pyrazino[1,2-a]indol-1-one Scaffold onto the Resin Prepared Above

##STR00129##

A solution of the acid derivative of formula (VII) (57 mg, 0.2 mmol, 2 eq), DIPEA (0.068 ml, 0.39 mmol, 4 eq.), PyBOP (102.75 mg, 0.2 mmol, 2 eq.) in dry DMA (2.0 ml) was stirred for 30 min then was added to resin of example 6 (0.1 mmol, 1 eq.) and the final suspension was shaken for 20 h at 25° C. The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml), MeOH (1 ml), water (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), MTBE (1 ml, 2 cycles) and then air dried.

Reduction of the Nitro Group

##STR00130##

The resin of formula (XVIII) (0.1 mmol, 1 eq.) was suspended in a 2M solution of SnCl₂*2H₂O in DMF (1.5 ml). The final compound of formula (XIX) in suspension was shaken for 48 hours at 25° C. The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml), MeOH (1 ml), water (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), MTBE (1 ml, 2 cycles) and then dried in nitrogen flux. The above resin bound 3,4-dihydro-2h-pyrazino[1,2-a]indol-1-one was further reacted according to the alternative steps below so as to get carboxamido, sulfonamido, ureido and amino derivatives.

EXAMPLE 1

Preparation of A28-M-B1

##STR00131##

A carboxylic acid of formula (VIII), wherein R^a corresponds to the fragment B1 of table II, (0.3 mmol, 3 eq.), was added to a the resin of example 8 wherein R^c corresponds to the fragment A28 of table I, in solution of DIPEA (68.5 μl, 0.4 mmol, 4 eq.) and PyBOP (156 mg, 0.3 mmol, 3 eq.) in dry DMF (2.5 ml) and the solution was stirred for 30 min then was added to the resin of example 8 (0.1 mmol, 1 eq.) and shaken at 25° C. in a reactor (Quest 210™ or Miniblocks™). The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml), MeOH (1 ml), water (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), MTBE (1 ml, 2 cycles) and then air dried. The Resin (0.1 mmol, 1 eq.) was suspended in a solution of TFA/DCM 1:1 (2 ml) and shaken for 2 h at 25° C. The solution phase was collected and the resin was rinsed with DCM (collected as well), and a second cycle was performed. The final washing was performed with MeOH. All the collected were dried under reduced pressure affording compound A28-M-B1 (see entry 754 of table III below).

LCMS (HPLC Method 1A): m/z 377 [M+H]⁺ @ r.t. 2.41 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 9.62 (s, 1H), 8.07 (s, 1H), 8.03 (d, J=4.9 Hz, 1H), 7.92 (t, J=5.6 Hz, 1H), 7.36-7.47 (m, 2H), 7.00 (s, 1H), 4.85-5.14 (m, 1H), 3.83 (dd, J=13.2, 4.3 Hz, 1H), 3.48 (dd, J=12.8, 5.6 Hz, 1H), 3.09 (s, 2H), 2.85-3.03 (m, 2H), 2.31 (s, 6H), 2.20 (br. s., 8H), 1.27-1.51 (m, 2H).

Following the procedure described in example 9 and by using any proper reactant as per the process of the invention that is, by supporting any suitable amine onto the resin, by acylating the amino function in position 8 of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety with any suitable carboxylic acid derivative and by finally carrying out resin cleavage, the following compounds of table III were also prepared.

TABLE III
		HPLC	HPLC
Entry	Compound	Method	tR (min)	[M + H]+
1	A2-M-B2	1B	0.49	429
2	A2-M-B3	1B	3.02	468
3	A2-M-B4	1B	3.09	506
4	A3-M-B2	1B	0.49	457
5	A3-M-B12	1B	3.15	519
6	A3-M-B4	1B	3.16	534
7	A4-M-B2	1B	0.53	402
8	A4-M-B3	1B	4.31	441
9	A4-M-B12	1B	4.26	464
10	A4-M-B4	1B	4.36	479
11	A5-M-B2	1B	2.47	448
12	A5-M-B3	1B	5.38	487
13	A5-M-B12	1B	5.35	510
14	A5-M-B4	1B	5.39	525
15	A6-M-B2	1B	2.37	414
16	A6-M-B3	1B	5.35	453
17	A6-M-B12	1B	5.33	476
18	A6-M-B4	1B	5.36	491
19	A7-M-B2	1B	0.55	384
20	A7-M-B3	1B	4.54	423
21	A7-M-B12	1B	4.48	446
22	A7-M-B4	1B	4.57	461
23	A8-M-B4	1B	3.15	506
24	A10-M-B14	1A	2.58	472
25	A10-M-B15	1A	2.49	425
26	A10-M-B16	1A	2.24	411
27	A10-M-B17	1A	3.22	475
28	A10-M-B18	1A	2.7	465
29	A10-M-B20	1A	2.55	453
30	A10-M-B22	1A	2.77	461
31	A10-M-B23	1A	2.98	461
32	A10-M-B24	1A	2.98	461
33	A10-M-B25	1A	3.06	453
34	A10-M-B26	1A	2.82	441
35	A10-M-B27	1A	2.63	427
36	A10-M-B28	1A	3.11	475
37	A10-M-B29	1A	2.57	472
38	A10-M-B30	1A	2.66	499
39	A10-M-B31	1A	2.54	483
40	A10-M-B33	1A	2.58	427
41	A10-M-B34	1A	3.1	483
42	A10-M-B35	1A	3.33	467
43	A10-M-B36	1A	2.76	439
44	A10-M-B37	1A	2.55	453
45	A10-M-B38	1A	2.74	467
46	A10-M-B39	1A	3.1	483
47	A10-M-B40	1A	3.11	475
48	A10-M-B41	1A	2.91	499
49	A10-M-B42	1A	2.83	499
50	A11-M-B33	1A	2.68	385
51	A10-M-B43	1A	2.59	427
52	A10-M-B44	1A	2.22	441
53	A10-M-B45	1A	2.26	498
54	A10-M-B46	1A	2.71	481
55	A10-M-B47	1A	2.1	399
56	A10-M-B48	1A	2.71	427
57	A10-M-B49	1A	2.36	413
58	A10-M-B50	1A	2.33	413
59	A10-M-B51	1A	2.85	465
60	A10-M-B52	1A	1.88	385
61	A10-M-B54	1A	2.86	465
62	A10-M-B59	1A	3.19	479
63	A10-M-B60	1A	2.47	465
64	A10-M-B61	1A	2.44	465
65	A12-M-B14	1A	2.46	513
66	A12-M-B15	1A	2.37	466
67	A12-M-B16	1A	2.14	452
68	A12-M-B17	1A	3.08	516
69	A12-M-B64	1A	1.96	489
70	A12-M-B20	1A	2.43	494
71	A12-M-B22	1A	2.63	502
72	A11-M-B34	1A	3.22	441
73	A12-M-B24	1A	2.83	502
74	A12-M-B25	1A	2.88	494
75	A12-M-B26	1A	2.67	482
76	A11-M-B35	1A	3.46	425
77	A12-M-B28	1A	2.96	516
78	A11-M-B36	1A	2.87	397
79	A12-M-B30	1A	2.54	540
80	A12-M-B31	1A	2.41	524
81	A12-M-B33	1A	2.45	468
82	A12-M-B65	1A	2.72	524
83	A12-M-B34	1A	2.96	524
84	A12-M-B35	1A	3.19	508
85	A12-M-B36	1A	2.62	480
86	A12-M-B66	1A	3.16	516
87	A12-M-B37	1A	2.43	494
88	A12-M-B38	1A	2.61	508
89	A12-M-B39	1A	2.95	524
90	A12-M-B40	1A	2.96	516
91	A12-M-B41	1A	2.76	540
92	A12-M-B43	1A	2.46	468
93	A12-M-B46	1A	2.57	523
94	A12-M-B47	1A	2	440
95	A12-M-B48	1A	2.57	468
96	A12-M-B49	1A	2.25	454
97	A12-M-B50	1A	2.2	454
98	A12-M-B51	1A	2.71	506
99	A13-M-B14	1A	2.62	430
100	A13-M-B15	1A	2.54	383
101	A13-M-B16	1A	2.28	369
102	A13-M-B17	1A	3.31	433
103	A13-M-B18	1A	2.77	423
104	A13-M-B64	1A	2.06	406
105	A13-M-B20	1A	2.6	411
106	A13-M-B22	1A	2.85	419
107	A13-M-B23	1A	3.06	419
108	A13-M-B24	1A	3.04	419
109	A13-M-B25	1A	3.12	411
110	A13-M-B26	1A	2.89	399
111	A13-M-B27	1A	2.7	385
112	A13-M-B28	1A	3.19	433
113	A13-M-B29	1A	2.62	430
114	A13-M-B30	1A	2.72	457
115	A13-M-B31	1A	2.58	441
116	A13-M-B33	1A	2.63	385
117	A13-M-B34	1A	3.19	441
118	A13-M-B35	1A	3.43	425
119	A13-M-B36	1A	2.83	397
120	A13-M-B66	1A	3.39	433
121	A13-M-B37	1A	2.61	411
122	A13-M-B38	1A	2.81	425
123	A13-M-B39	1A	3.16	441
124	A13-M-B40	1A	3.19	433
125	A13-M-B41	1A	2.98	457
126	A13-M-B42	1A	2.88	457
127	A13-M-B67	1A	3.22	457
128	A13-M-B43	1A	2.63	385
129	A13-M-B44	1A	2.24	399
130	A13-M-B45	1A	2.3	456
131	A13-M-B46	1A	2.77	439
132	A13-M-B47	1A	2.12	357
133	A13-M-B48	1A	2.78	385
134	A13-M-B49	1A	2.4	371
135	A13-M-B50	1A	2.37	371
136	A13-M-B51	1A	2.91	423
137	A13-M-B54	1A	2.92	423
138	A13-M-B59	1A	3.26	437
139	A13-M-B68	1A	2.31	409
140	A13-M-B60	1A	2.52	423
141	A13-M-B61	1A	2.5	423
142	A14-M-B14	1A	3	478
143	A14-M-B15	1A	2.96	431
144	A14-M-B16	1A	2.69	417
145	A14-M-B17	1A	3.62	481
146	A14-M-B18	1A	3.14	471
147	A14-M-B20	1A	2.99	459
148	A14-M-B22	1A	3.22	467
149	A14-M-B23	1A	3.41	467
150	A14-M-B24	1A	3.39	467
151	A14-M-B25	1A	3.48	459
152	A14-M-B26	1A	3.28	447
153	A14-M-B28	1A	3.53	481
154	A14-M-B29	1A	2.99	478
155	A14-M-B30	1A	3.09	505
156	A14-M-B31	1A	2.95	489
157	A14-M-B33	1A	3.05	433
158	A14-M-B34	1A	3.55	489
159	A14-M-B35	1A	3.73	473
160	A14-M-B66	1A	3.7	481
161	A14-M-B37	1A	3.01	459
162	A14-M-B38	1A	3.18	473
163	A14-M-B39	1A	3.52	489
164	A14-M-B40	1A	3.52	481
165	A14-M-B41	1A	3.35	505
166	A14-M-B42	1A	3.26	505
167	A14-M-B67	1A	3.55	505
168	A14-M-B44	1A	2.65	447
169	A14-M-B45	1A	2.68	504
170	A14-M-B52	1A	2.28	391
171	A14-M-B54	1A	3.3	471
172	A14-M-B59	1A	3.58	485
173	A15-M-B14	1A	2.83	444
174	A15-M-B15	1A	2.78	397
175	A15-M-B16	1A	2.51	383
176	A15-M-B17	1A	3.5	447
177	A15-M-B18	1A	2.99	437
178	A15-M-B20	1A	2.82	425
179	A15-M-B22	1A	3.06	433
180	A15-M-B23	1A	3.26	433
181	A15-M-B24	1A	3.25	433
182	A15-M-B25	1A	3.33	425
183	A15-M-B26	1A	3.13	413
184	A11-M-B66	1A	3.43	433
185	A15-M-B29	1A	2.83	444
186	A15-M-B30	1A	2.93	471
187	A15-M-B31	1A	2.8	455
188	A15-M-B33	1A	2.87	399
189	A15-M-B34	1A	3.4	455
190	A15-M-B35	1A	3.62	439
191	A1 1-M-B37	1A	2.64	411
192	A15-M-B37	1A	2.84	425
193	A15-M-B38	1A	3.02	439
194	A15-M-B39	1A	3.37	455
195	A15-M-B40	1A	3.38	447
196	A15-M-B41	1A	3.2	471
197	A15-M-B42	1A	3.1	471
198	A15-M-B67	1A	3.41	471
199	A15-M-B44	1A	2.45	413
200	A15-M-B45	1A	2.5	470
201	A15-M-B52	1A	2.09	357
202	A15-M-B54	1A	3.14	437
203	A15-M-B59	1A	3.46	451
204	A16-M-B14	1A	2.91	456
205	A16-M-B15	1A	2.87	409
206	A16-M-B16	1A	2.6	395
207	A16-M-B17	1A	3.57	459
208	A16-M-B18	1A	3.07	449
209	A16-M-B64	1A	2.33	432
210	A16-M-B20	1A	2.91	437
211	A16-M-B22	1A	3.15	445
212	A16-M-B23	1A	3.35	445
213	A16-M-B24	1A	3.33	445
214	A16-M-B25	1A	3.42	437
215	A16-M-B26	1A	3.21	425
216	A16-M-B27	1A	3.03	411
217	A16-M-B28	1A	3.45	459
218	A16-M-B29	1A	2.91	456
219	A16-M-B30	1A	3.01	483
220	A16-M-B31	1A	2.87	467
221	A16-M-B33	1A	2.97	411
222	A16-M-B34	1A	3.49	467
223	A16-M-B35	1A	3.69	451
224	A16-M-B36	1A	3.14	423
225	A16-M-B66	1A	3.64	459
226	A16-M-B37	1A	2.93	437
227	A16-M-B38	1A	3.11	451
228	A16-M-B39	1A	3.47	467
229	A16-M-B40	1A	3.47	459
230	A16-M-B41	1A	3.28	483
231	A16-M-B42	1A	3.18	483
232	A16-M-B67	1A	3.49	483
233	A16-M-B43	1A	2.98	411
234	A16-M-B44	1A	2.54	425
235	A16-M-B45	1A	2.59	482
236	A16-M-B46	1A	3.07	465
237	A16-M-B47	1A	2.42	383
238	A16-M-B48	1A	3.09	411
239	A16-M-B49	1A	2.74	397
240	A16-M-B50	1A	2.7	397
241	A16-M-B51	1A	3.22	449
242	A16-M-B52	1A	2.16	369
243	A16-M-B54	1A	3.22	449
244	A16-M-B59	1A	3.53	463
245	A11-M-B38	1A	2.84	425
246	A16-M-B61	1A	2.78	449
247	A17-M-B14	1A	2.74	468
248	A17-M-B17	1A	3.39	471
249	A11-M-B39	1A	3.21	441
250	A18-M-B14	1A	3.15	492
251	A18-M-B15	1A	3.14	445
252	A18-M-B16	1A	2.88	431
253	A18-M-B17	1A	3.73	495
254	A18-M-B18	1A	3.28	485
255	A18-M-B20	1A	3.15	473
256	A18-M-B22	1A	3.35	481
257	A18-M-B23	1A	3.55	481
258	A18-M-B25	1A	3.62	473
259	A18-M-B26	1A	3.44	461
260	A11-M-B40	1A	3.21	433
261	A11-M-B41	1A	3.02	457
262	A18-M-B30	1A	3.24	519
263	A11-M-B42	1A	2.91	457
264	A18-M-B33	1A	3.23	447
265	A18-M-B34	1A	3.68	503
266	A18-M-B35	1A	3.85	487
267	A18-M-B66	1A	3.81	495
268	A18-M-B37	1A	3.17	473
269	A18-M-B38	1A	3.31	487
270	A18-M-B39	1A	3.65	503
271	A11-M-B67	1A	3.24	457
272	A18-M-B41	1A	3.47	519
273	A18-M-B42	1A	3.4	519
274	A18-M-B67	1A	3.66	519
275	A11-M-B43	1A	2.68	385
276	A18-M-B45	1A	2.86	518
277	A18-M-B52	1A	2.49	405
278	A18-M-B54	1A	3.45	485
279	A18-M-B59	1A	3.71	499
280	A4-M-B15	1A	2.33	399
281	A4-M-B16	1A	2.1	385
282	A4-M-B17	1A	3.09	449
283	A4-M-B18	1A	2.57	439
284	A4-M-B64	1A	1.9	422
285	A4-M-B20	1A	2.39	427
286	A4-M-B22	1A	2.63	435
287	A4-M-B23	1A	2.86	435
288	A4-M-B24	1A	2.83	435
289	A4-M-B25	1A	2.89	427
290	A4-M-B26	1A	2.65	415
291	A4-M-B27	1A	2.48	401
292	A4-M-B28	1A	2.96	449
293	A4-M-B29	1A	2.43	446
294	A4-M-B30	1A	2.52	473
295	A4-M-B31	1A	2.4	457
296	A4-M-B33	1A	2.42	401
297	A4-M-B34	1A	2.96	457
298	A4-M-B35	1A	3.21	441
299	A4-M-B36	1A	2.61	413
300	A11-M-B44	1A	2.28	399
301	A4-M-B37	1A	2.4	427
302	A4-M-B38	1A	2.6	441
303	A4-M-B39	1A	2.93	457
304	A4-M-B40	1A	2.97	449
305	A4-M-B41	1A	2.76	473
306	A4-M-B42	1A	2.67	473
307	A4-M-B67	1A	3	473
308	A4-M-B43	1A	2.43	401
309	A4-M-B44	1A	2.08	415
310	A4-M-B46	1A	2.56	455
311	A4-M-B47	1A	1.96	373
312	A4-M-B48	1A	2.56	401
313	A4-M-B49	1A	2.21	387
314	A4-M-B50	1A	2.17	387
315	A4-M-B51	1A	2.69	439
316	A4-M-B54	1A	2.7	439
317	A4-M-B59	1A	3.06	453
318	A4-M-B60	1A	2.34	439
319	A4-M-B61	1A	2.33	439
320	A19-M-B17	1A	3.15	419
321	A19-M-B64	1A	1.91	392
322	A19-M-B25	1A	2.95	397
323	A19-M-B26	1A	2.7	385
324	A19-M-B28	1A	3.01	419
325	A19-M-B29	1A	2.46	416
326	A19-M-B30	1A	2.55	443
327	A19-M-B31	1A	2.42	427
328	A19-M-B33	1A	2.46	371
329	A19-M-B65	1A	2.78	427
330	A19-M-B34	1A	3.01	427
331	A19-M-B35	1A	3.28	411
332	A19-M-B66	1A	3.24	419
333	A19-M-B37	1A	2.42	397
334	A19-M-B38	1A	2.64	411
335	A11-M-B45	1A	2.32	456
336	A19-M-B40	1A	3.01	419
337	A19-M-B41	1A	2.81	443
338	A19-M-B42	1A	2.71	443
339	A19-M-B67	1A	3.05	443
340	A11-M-B46	1A	2.8	439
341	A19-M-B45	1A	2.14	442
342	A19-M-B52	1A	1.76	329
343	A19-M-B54	1A	2.74	409
344	A19-M-B59	1A	3.09	423
345	A19-M-B68	1A	2.17	395
346	A19-M-B61	1A	2.36	409
347	A20-M-B14	1A	3.39	484
348	A20-M-B15	1A	3.4	437
349	A20-M-B16	1A	3.23	423
350	A20-M-B17	1A	4	487
351	A20-M-B18	1A	3.58	477
352	A20-M-B64	1A	2.87	460
353	A20-M-B20	1A	3.46	465
354	A20-M-B22	1A	3.67	473
355	A20-M-B23	1A	3.83	473
356	A20-M-B24	1A	3.81	473
357	A11-M-B47	1A	2.15	357
358	A20-M-B26	1A	3.73	453
359	A20-M-B28	1A	3.93	487
360	A20-M-B29	1A	3.44	484
361	A20-M-B30	1A	3.51	511
362	A20-M-B31	1A	3.4	495
363	A20-M-B33	1A	3.56	439
364	A20-M-B36	1A	3.7	451
365	A20-M-B66	1A	4.07	487
366	A20-M-B37	1A	3.49	465
367	A20-M-B39	1A	3.93	495
368	A20-M-B40	1A	3.93	487
369	A20-M-B42	1A	3.68	511
370	A20-M-B67	1A	3.92	511
371	A20-M-B43	1A	3.53	439
372	A20-M-B44	1A	3.14	453
373	A20-M-B45	1A	3.17	510
374	A20-M-B46	1A	3.58	494
375	A20-M-B47	1A	3.09	411
376	A20-M-B49	1A	3.28	425
377	A20-M-B52	1A	2.75	397
378	A20-M-B54	1A	3.73	477
379	A20-M-B59	1A	3.95	491
380	A20-M-B60	1A	3.33	477
381	A7-M-B17	1A	3.25	431
382	A7-M-B64	1A	1.99	404
383	A7-M-B25	1A	3.06	409
384	A7-M-B26	1A	2.84	397
385	A7-M-B28	1A	3.13	431
386	A7-M-B29	1A	2.56	428
387	A7-M-B30	1A	2.67	455
388	A7-M-B31	1A	2.52	439
389	A7-M-B33	1A	2.58	383
390	A7-M-B65	1A	2.88	439
391	A7-M-B34	1A	3.13	439
392	A7-M-B35	1A	3.38	423
393	A7-M-B66	1A	3.35	431
394	A7-M-B37	1A	2.55	409
395	A7-M-B38	1A	2.75	423
396	A7-M-B39	1A	3.11	439
397	A7-M-B40	1A	3.13	431
398	A7-M-B41	1A	2.92	455
399	A7-M-B42	1A	2.83	455
400	A7-M-B67	1A	3.15	455
401	A7-M-B44	1A	2.19	397
402	A7-M-B45	1A	2.26	454
403	A7-M-B52	1A	1.85	341
404	A7-M-B1	1A	2.65	403
405	A7-M-B54	1A	2.86	421
406	A7-M-B59	1A	3.2	435
407	A 11-M-B48	1A	2.82	385
408	A21-M-B14	1A	3.07	496
409	A21-M-B15	1A	3.07	449
410	A21-M-B16	1A	2.8	435
411	A21-M-B17	1A	3.7	499
412	A21-M-B18	1A	3.22	489
413	A21-M-B64	1A	2.51	472
414	A21-M-B20	1A	3.07	477
415	A21-M-B22	1A	3.32	485
416	A21-M-B23	1A	3.5	485
417	A21-M-B24	1A	3.47	485
418	A21-M-B25	1A	3.58	477
419	A21-M-B26	1A	3.39	465
420	A21-M-B27	1A	3.22	451
421	A21-M-B28	1A	3.61	499
422	A21-M-B29	1A	3.05	496
423	A21-M-B30	1A	3.16	523
424	A21-M-B31	1A	3.02	507
425	A21-M-B33	1A	3.17	451
426	A21-M-B34	1A	3.62	507
427	A21-M-B35	1A	3.8	491
428	A21-M-B36	1A	3.34	463
429	A21-M-B66	1A	3.76	499
430	A21-M-B37	1A	3.1	477
431	A21-M-B38	1A	3.28	491
432	A21-M-B39	1A	3.59	507
433	A21-M-B40	1A	3.61	499
434	A21-M-B41	1A	3.43	523
435	A21-M-B42	1A	3.33	523
436	A21-M-B67	1A	3.61	523
437	A21-M-B43	1A	3.21	451
438	A21-M-B44	1A	2.76	465
439	A21-M-B45	1A	2.73	522
440	A21-M-B46	1A	3.23	505
441	A21-M-B47	1A	2.64	423
442	A21-M-B48	1A	3.27	451
443	A21-M-B49	1A	2.93	437
444	A21-M-B50	1A	2.92	437
445	A21-M-B52	1A	2.37	409
446	A21-M-B54	1A	3.37	489
447	A21-M-B59	1A	3.64	503
448	A21-M-B68	1A	2.75	475
449	A21-M-B60	1A	2.96	489
450	A21-M-B61	1A	2.93	489
451	A22-M-B14	1A	2.48	428
452	A22-M-B15	1A	2.37	381
453	A22-M-B16	1A	2.13	367
454	A22-M-B17	1A	3.15	431
455	A22-M-B18	1A	2.62	421
456	A11-M-B49	1A	2.44	371
457	A22-M-B20	1A	2.43	409
458	A22-M-B22	1A	2.67	417
459	A22-M-B23	1A	2.91	417
460	A22-M-B24	1A	2.88	417
461	A22-M-B25	1A	2.96	409
462	A22-M-B26	1A	2.71	397
463	A22-M-B27	1A	2.54	383
464	A22-M-B28	1A	3.02	431
465	A22-M-B29	1A	2.47	428
466	A22-M-B30	1A	2.56	455
467	A22-M-B31	1A	2.43	439
468	A22-M-B33	1A	2.46	383
469	A22-M-B34	1A	3.03	439
470	A22-M-B35	1A	3.29	423
471	A22-M-B36	1A	2.66	395
472	A22-M-B66	1A	3.25	431
473	A22-M-B37	1A	2.44	409
474	A22-M-B38	1A	2.64	423
475	A22-M-B39	1A	3	439
476	A22-M-B40	1A	3.02	431
477	A22-M-B41	1A	2.82	455
478	A22-M-B42	1A	2.72	455
479	A22-M-B67	1A	3.07	455
480	A22-M-B43	1A	2.46	383
481	A22-M-B44	1A	2.11	397
482	A22-M-B45	1A	2.16	454
483	A22-M-B46	1A	2.62	437
484	A22-M-B47	1A	1.98	355
485	A22-M-B48	1A	2.61	383
486	A22-M-B49	1A	2.25	369
487	A22-M-B51	1A	2.74	421
488	A22-M-B52	1A	1.76	341
489	A22-M-B54	1A	2.75	421
490	A22-M-B59	1A	3.1	435
491	A23-M-B14	1A	3.04	496
492	A23-M-B15	1A	3.02	449
493	A23-M-B16	1A	2.76	435
494	A23-M-B17	1A	3.65	499
495	A23-M-B18	1A	3.2	489
496	A23-M-B64	1A	2.5	472
497	A23-M-B20	1A	3.04	477
498	A23-M-B22	1A	3.28	485
499	A23-M-B23	1A	3.46	485
500	A23-M-B24	1A	3.42	485
501	A23-M-B25	1A	3.53	477
502	A23-M-B26	1A	3.33	465
503	A23-M-B27	1A	3.16	451
504	A23-M-B28	1A	3.56	499
505	A23-M-B29	1A	3.04	496
506	A23-M-B30	1A	3.13	523
507	A23-M-B31	1A	2.99	507
508	A23-M-B33	1A	3.12	451
509	A23-M-B34	1A	3.59	507
510	A23-M-B35	1A	3.77	491
511	A23-M-B36	1A	3.29	463
512	A23-M-B66	1A	3.73	499
513	A23-M-B37	1A	3.06	477
514	A23-M-B38	1A	3.24	491
515	A23-M-B39	1A	3.56	507
516	A23-M-B40	1A	3.57	499
517	A23-M-B41	1A	3.39	523
518	A23-M-B42	1A	3.31	523
519	A23-M-B67	1A	3.58	523
520	A23-M-B43	1A	3.14	451
521	A23-M-B44	1A	2.7	465
522	A23-M-B45	1A	2.73	522
523	A23-M-B46	1A	3.2	505
524	A23-M-B47	1A	2.6	423
525	A23-M-B48	1A	3.23	451
526	A23-M-B49	1A	2.88	437
527	A23-M-B50	1A	2.85	437
528	A23-M-B51	1A	3.33	489
529	A23-M-B52	1A	2.35	409
530	A23-M-B54	1A	3.34	489
531	A23-M-B59	1A	3.62	503
532	A11-M-B54	1A	2.95	423
533	A23-M-B61	1A	2.9	489
534	A24-M-B14	1A	3.19	492
535	A24-M-B15	1A	3.18	445
536	A24-M-B16	1A	2.92	431
537	A24-M-B17	1A	3.8	495
538	A24-M-B18	1A	3.33	485
539	A24-M-B64	1A	2.66	468
540	A24-M-B20	1A	3.2	473
541	A24-M-B22	1A	3.42	481
542	A24-M-B23	1A	3.59	481
543	A24-M-B24	1A	3.58	481
544	A24-M-B25	1A	3.67	473
545	A24-M-B26	1A	3.49	461
546	A24-M-B27	1A	3.32	447
547	A24-M-B28	1A	3.71	495
548	A24-M-B29	1A	3.19	492
549	A24-M-B30	1A	3.27	519
550	A24-M-B31	1A	3.14	503
551	A24-M-B33	1A	3.27	447
552	A24-M-B34	1A	3.74	503
553	A24-M-B35	1A	3.88	487
554	A24-M-B36	1A	3.44	459
555	A24-M-B66	1A	3.87	495
556	A24-M-B37	1A	3.23	473
557	A24-M-B38	1A	3.38	487
558	A24-M-B39	1A	3.7	503
559	A24-M-B40	1A	3.7	495
560	A24-M-B41	1A	3.54	519
561	A24-M-B42	1A	3.45	519
562	A24-M-B67	1A	3.71	519
563	A24-M-B43	1A	3.31	447
564	A24-M-B44	1A	2.87	461
565	A24-M-B45	1A	2.89	518
566	A24-M-B46	1A	3.34	501
567	A24-M-B47	1A	2.76	419
568	A24-M-B48	1A	3.38	447
569	A24-M-B49	1A	3.06	433
570	A24-M-B50	1A	3.03	433
571	A24-M-B52	1A	2.52	405
572	A24-M-B54	1A	3.49	485
573	A24-M-B59	1A	3.76	499
574	A24-M-B60	1A	3.09	485
575	A25-M-B14	1A	3.23	492
576	A25-M-B15	1A	3.23	445
577	A25-M-B16	1A	2.97	431
578	A25-M-B17	1A	3.81	495
579	A25-M-B18	1A	3.37	485
580	A25-M-B64	1A	2.71	468
581	A25-M-B20	1A	3.24	473
582	A25-M-B22	1A	3.47	481
583	A25-M-B23	1A	3.63	481
584	A25-M-B24	1A	3.62	481
585	A25-M-B25	1A	3.7	473
586	A25-M-B26	1A	3.53	461
587	A25-M-B27	1A	3.36	447
588	A25-M-B28	1A	3.73	495
589	A25-M-B29	1A	3.23	492
590	A25-M-B30	1A	3.33	519
591	A25-M-B31	1A	3.2	503
592	A25-M-B33	1A	3.33	447
593	A25-M-B34	1A	3.77	503
594	A25-M-B35	1A	3.92	487
595	A25-M-B36	1A	3.48	459
596	A25-M-B66	1A	3.89	495
597	A25-M-B37	1A	3.27	473
598	A25-M-B38	1A	3.41	487
599	A25-M-B39	1A	3.74	503
600	A25-M-B40	1A	3.73	495
601	A25-M-B42	1A	3.49	519
602	A25-M-B67	1A	3.75	519
603	A25-M-B43	1A	3.36	447
604	A25-M-B44	1A	2.92	461
605	A25-M-B45	1A	2.93	518
606	A25-M-B46	1A	3.38	501
607	A25-M-B47	1A	2.83	419
608	A25-M-B48	1A	3.43	447
609	A25-M-B49	1A	3.11	433
610	A25-M-B50	1A	3.09	433
611	A25-M-B52	1A	2.58	405
612	A25-M-B54	1A	3.52	485
613	A25-M-B59	1A	3.78	499
614	A25-M-B68	1A	2.92	471
615	A25-M-B61	1A	3.08	485
616	A26-M-B14	1A	3.39	484
617	A26-M-B15	1A	3.43	437
618	A26-M-B16	1A	3.17	423
619	A26-M-B17	1A	3.97	487
620	A26-M-B18	1A	3.53	477
621	A26-M-B64	1A	2.89	460
622	A26-M-B20	1A	3.42	465
623	A26-M-B22	1A	3.64	473
624	A26-M-B23	1A	3.79	473
625	A26-M-B24	1A	3.78	473
626	A26-M-B25	1A	3.88	465
627	A26-M-B27	1A	3.54	439
628	A26-M-B28	1A	3.88	487
629	A26-M-B29	1A	3.38	484
630	A26-M-B30	1A	3.47	511
631	A26-M-B31	1A	3.35	495
632	A26-M-B33	1A	3.51	439
633	A26-M-B34	1A	3.93	495
634	A26-M-B35	1A	4.07	479
635	A26-M-B36	1A	3.66	451
636	A26-M-B66	1A	4.04	487
637	A26-M-B37	1A	3.45	465
638	A26-M-B38	1A	3.58	479
639	A26-M-B39	1A	3.9	495
640	A26-M-B40	1A	3.89	487
641	A26-M-B41	1A	3.74	511
642	A26-M-B42	1A	3.65	511
643	A26-M-B67	1A	3.89	511
644	A26-M-B43	1A	3.56	439
645	A26-M-B45	1A	3.11	510
646	A26-M-B46	1A	3.54	494
647	A26-M-B47	1A	3.03	411
648	A26-M-B48	1A	3.6	439
649	A26-M-B49	1A	3.3	425
650	A26-M-B50	1A	3.27	425
651	A26-M-B52	1A	2.78	397
652	A26-M-B54	1A	3.7	477
653	A26-M-B59	1A	3.95	491
654	A26-M-B61	1A	3.25	477
655	A27-M-B14	1A	3.14	470
656	A27-M-B15	1A	3.12	423
657	A27-M-B16	1A	2.86	409
658	A27-M-B17	1A	3.77	473
659	A27-M-B18	1A	3.29	463
660	A27-M-B64	1A	2.58	446
661	A27-M-B20	1A	3.15	451
662	A27-M-B22	1A	3.38	459
663	A27-M-B23	1A	3.56	459
664	A27-M-B24	1A	3.55	459
665	A27-M-B25	1A	3.63	451
666	A27-M-B26	1A	3.45	439
667	A27-M-B27	1A	3.27	425
668	A27-M-B28	1A	3.67	473
669	A27-M-B29	1A	3.14	470
670	A27-M-B30	1A	3.23	497
671	A27-M-B31	1A	3.1	481
672	A27-M-B33	1A	3.22	425
673	A27-M-B34	1A	3.7	481
674	A27-M-B35	1A	3.87	465
675	A27-M-B36	1A	3.39	437
676	A27-M-B66	1A	3.83	473
677	A27-M-B37	1A	3.16	451
678	A27-M-B38	1A	3.33	465
679	A27-M-B39	1A	3.67	481
680	A27-M-B40	1A	3.67	473
681	A27-M-B41	1A	3.5	497
682	A27-M-B42	1A	3.4	497
683	A27-M-B67	1A	3.69	497
684	A27-M-B43	1A	3.26	425
685	A27-M-B44	1A	2.8	439
686	A27-M-B45	1A	2.82	496
687	A27-M-B46	1A	3.29	479
688	A27-M-B47	1A	2.7	397
689	A27-M-B48	1A	3.33	425
690	A27-M-B49	1A	2.99	411
691	A27-M-B50	1A	2.97	411
692	A27-M-B51	1A	3.45	463
693	A27-M-B54	1A	3.45	463
694	A27-M-B59	1A	3.73	477
695	A27-M-B60	1A	3.03	463
696	A11-M-B59	1A	3.28	437
697	A1-M-B15	1A	2.86	397
698	A1-M-B16	1A	2.59	383
699	A1-M-B17	1A	3.55	447
700	A1-M-B18	1A	3.05	437
701	A1-M-B20	1A	2.89	425
702	A1-M-B22	1A	3.14	433
703	A1-M-B23	1A	3.33	433
704	A1-M-B24	1A	3.32	433
705	A1-M-B25	1A	3.41	425
706	A1-M-B26	1A	3.21	413
707	A1-M-B27	1A	3.02	399
708	A1-M-B28	1A	3.45	447
709	A1-M-B29	1A	2.89	444
710	A1-M-B30	1A	2.99	471
711	A1-M-B33	1A	2.97	399
712	A1-M-B65	1A	3.23	455
713	A1-M-B34	1A	3.48	455
714	A11-M-B60	1A	2.56	423
715	A1-M-B36	1A	3.14	411
716	A1-M-B66	1A	3.63	447
717	A1-M-B37	1A	2.91	425
718	A1-M-B38	1A	3.09	439
719	A1-M-B39	1A	3.45	455
720	A11-M-B61	1A	2.53	423
721	A1-M-B41	1A	3.26	471
722	A1-M-B42	1A	3.17	471
723	A1-M-B43	1A	3	399
724	A1-M-B45	1A	2.57	470
725	A1-M-B46	1A	3.06	453
726	A1-M-B47	1A	2.42	371
727	A1-M-B48	1A	3.08	399
728	A1-M-B49	1A	2.72	385
729	A1-M-B51	1A	3.2	437
730	A1-M-B52	1A	2.16	357
731	A1-M-B54	1A	3.21	437
732	A1-M-B59	1A	3.52	451
733	A1-M-B60	1A	2.79	437
734	A28-M-B17	1A	3.03	405
735	A28-M-B25	1A	2.82	383
736	A28-M-B26	1A	2.56	371
737	A28-M-B28	1A	2.89	405
738	A28-M-B29	1A	2.34	402
739	A28-M-B30	1A	2.44	429
740	A28-M-B31	1A	2.3	413
741	A28-M-B33	1A	2.33	357
742	A28-M-B65	1A	2.64	413
743	A28-M-B34	1A	2.86	413
744	A28-M-B35	1A	3.15	397
745	A28-M-B66	1A	3.12	405
746	A28-M-B37	1A	2.3	383
747	A28-M-B39	1A	2.85	413
748	A28-M-B40	1A	2.89	405
749	A28-M-B41	1A	2.68	429
750	A28-M-B42	1A	2.57	429
751	A28-M-B67	1A	2.91	429
752	A28-M-B45	1A	2.04	428
753	A28-M-B52	1A	1.67	315
754	A28-M-B1	1A	2.41	377
755	A28-M-B54	1A	2.6	395
756	A28-M-B59	1A	2.97	409
757	A11-M-B14	1A	2.65	430
758	A11-M-B15	1A	2.58	383
759	A11-M-B17	1A	3.33	433
760	A11-M-B18	1A	2.8	423
761	A11-M-B20	1A	2.63	411
762	A11-M-B22	1A	2.87	419
763	A11-M-B23	1A	3.08	419
764	A11-M-B24	1A	3.07	419
765	A11-M-B25	1A	3.15	411
766	A11-M-B26	1A	2.92	399
767	A11-M-B27	1A	2.74	385
768	A11-M-B28	1A	3.21	433
769	A11-M-B29	1A	2.65	430
770	A11-M-B30	1A	2.74	457
771	A25-M-B41	1A	3.58	519
772	A14-M-B70	2	5.28	546
773	A14-M-B71	2	4.76	467

EXAMPLE 2

Preparation of A2-M-B9

##STR00132##

A sulfonyl chloride of formula (X), wherein R^a corresponds to fragment B9 of table II, (0.12 mmol, 1.2 eq.) was added to a suspension of the resin of example 8 wherein Rc corresponds to the fragment A2 of table I (0.1 mmol, 1 eq.) in dry DCM (2.5 ml) and N-methyl morpholine (22.0 μl, 0.2 mmol, 2 eq.). The final suspension was shaken overnight at 25° C. in a reactor (Quest 210™ or Miniblocks™). The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml), MeOH (1 ml), water (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), MTBE (1 ml, 2 cycles) and then air dried. The Resin (0.1 mmol, 1 eq.) was suspended in a solution of TFA/DCM 1:1 (2 ml) and shaken for 2 h at 25° C. The solution phase was collected and the resin was rinsed with DCM (collected as well), and a second cycle was performed. The final washing was performed with MeOH. All the collected were dried under reduced pressure affording compound A2-M-B9 (see entry 774 of table IV below).

LCMS (HPLC Method 1B): m/z 519 [M+H]⁺ @ r.t. 3.2 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 8.03 (d, J=5.0 Hz, 1H), 7.86 (t, J=5.4 Hz, 1H), 7.66-7.72 (m, 2H), 7.56-7.61 (m, 2H), 7.37 (d, J=8.9 Hz, 1H), 7.33 (d, J=1.8 Hz, 1H), 6.99 (dd, J=9.0, 2.0 Hz, 1H), 6.96 (s, 1H), 4.91-5.00 (m, 1H), 3.77 (dd, J=13.0, 4.5 Hz, 1H), 3.42-3.49 (m, 1H), 2.85-2.94 (m, 2H), 2.38-2.58 (m, 2H), 2.13 (br. s., 8H), 1.29-1.40 (m, 2H).

Following the procedure described in example 10 and by using any proper reactant as per the process of the invention that is, by supporting any suitable amine onto the resin, by sulfonylation the amino function in position 8 of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety with any suitable sulfonyl chloride derivative and by finally carrying out resin cleavage, the following compounds of table IV were also prepared.

TABLE IV
		HPLC	HPLC
Entry	Compound	Method	tR (min)	[M + H]+
774	A2-M-B9	1B	3.2	519
775	A2-M-B10	1B	2.51	490
776	A2-M-B11	1B	2.79	520
777	A3-M-B9	1B	3.25	547
778	A3-M-B10	1B	2.55	518
779	A3-M-B11	1B	2.83	548
780	A4-M-B9	1B	4.46	491
781	A4-M-B10	1B	3.54	463
782	A4-M-B11	1B	3.94	493
783	A5-M-B9	1B	5.45	538
784	A5-M-B13	1B	4.72	509
785	A5-M-B10	1B	4.69	509
786	A5-M-B11	1B	5.04	539
787	A6-M-B9	1B	5.42	504
788	A6-M-B10	1B	4.6	475
789	A6-M-B11	1B	4.97	505
790	A7-M-B9	1B	4.67	473
791	A7-M-B10	1B	3.73	445
792	A7-M-B11	1B	4.14	475
793	A10-M-B19	1A	1.87	421
794	A10-M-B21	1A	2.74	497
795	A10-M-B32	1A	2.02	435
796	A11-M-B32	1A	2.03	393
797	A10-M-B55	1A	2.65	518
798	A10-M-B62	1A	2.95	515
799	A10-M-B63	1A	2.95	519
800	A13-M-B19	1A	1.84	379
801	A13-M-B21	1A	2.78	455
802	A13-M-B32	1A	1.99	393
803	A13-M-B55	1A	2.68	475
804	A13-M-B62	1A	3	473
805	A13-M-B63	1A	3.01	477
806	A14-M-B19	1A	2.26	427
807	A14-M-B21	1A	3.12	503
808	A14-M-B32	1A	2.42	441
809	A14-M-B55	1A	3.06	524
810	A14-M-B62	1A	3.32	521
811	A14-M-B63	1A	3.33	525
812	A15-M-B19	1A	2.04	393
813	A15-M-B21	1A	2.97	469
814	A15-M-B32	1A	2.21	407
815	A15-M-B55	1A	2.87	489
816	A15-M-B62	1A	3.19	487
817	A15-M-B63	1A	3.21	491
818	A16-M-B19	1A	2.11	405
819	A16-M-B21	1A	3.04	481
820	A16-M-B32	1A	2.29	419
821	A16-M-B69	1A	2.96	481
822	A16-M-B55	1A	2.94	502
823	A16-M-B62	1A	3.25	499
824	A16-M-B63	1A	3.28	503
825	A17-M-B19	1A	1.99	417
826	A17-M-B21	1A	2.88	493
827	A17-M-B32	1A	2.15	431
828	A17-M-B62	1A	3.09	511
829	A17-M-B63	1A	3.09	515
830	A18-M-B21	1A	3.26	517
831	A18-M-B32	1A	2.62	455
832	A18-M-B55	1A	3.18	538
833	A18-M-B62	1A	3.45	535
834	A18-M-B63	1A	3.48	539
835	A4-M-B19	1A	1.73	395
836	A4-M-B21	1A	2.6	471
837	A4-M-B32	1A	1.88	409
838	A4-M-B69	1A	2.49	471
839	A4-M-B55	1A	2.51	491
840	A4-M-B62	1A	2.82	489
841	A4-M-B63	1A	2.8	493
842	A19-M-B19	1A	1.72	365
843	A19-M-B21	1A	2.63	441
844	A19-M-B32	1A	1.87	379
845	A20-M-B19	1A	2.68	433
846	A20-M-B21	1A	3.45	509
847	A20-M-B32	1A	2.84	447
848	A20-M-B69	1A	3.48	509
849	A20-M-B55	1A	3.36	530
850	A20-M-B62	1A	3.63	527
851	A20-M-B63	1A	3.74	531
852	A7-M-B19	1A	1.8	377
853	A7-M-B21	1A	2.73	453
854	A7-M-B32	1A	1.96	391
855	A7-M-B55	1A	2.63	473
856	A7-M-B62	1A	2.95	471
857	A7-M-B63	1A	2.95	475
858	A21-M-B19	1A	2.36	445
859	A21-M-B21	1A	3.21	521
860	A21-M-B32	1A	2.54	459
861	A21-M-B55	1A	3.15	542
862	A21-M-B62	1A	3.39	539
863	A21-M-B63	1A	3.4	543
864	A22-M-B19	1A	1.72	377
865	A22-M-B21	1A	2.63	453
866	A22-M-B32	1A	1.87	391
867	A22-M-B55	1A	2.54	473
868	A22-M-B62	1A	2.85	471
869	A22-M-B63	1A	2.83	475
870	A23-M-B19	1A	2.33	445
871	A23-M-B21	1A	3.16	521
872	A23-M-B32	1A	2.5	459
873	A23-M-B55	1A	3.1	542
874	A23-M-B62	1A	3.34	539
875	A23-M-B63	1A	3.38	543
876	A24-M-B19	1A	2.5	441
877	A24-M-B21	1A	3.3	517
878	A24-M-B32	1A	2.66	455
879	A24-M-B69	1A	3.24	517
880	A24-M-B55	1A	3.23	538
881	A11-M-B55	1A	2.71	475
882	A24-M-B62	1A	3.48	535
883	A24-M-B63	1A	3.51	539
884	A25-M-B19	1A	2.57	441
885	A25-M-B21	1A	3.36	517
886	A25-M-B32	1A	2.72	455
887	A25-M-B55	1A	3.28	538
888	A25-M-B62	1A	3.53	535
889	A25-M-B63	1A	3.57	539
890	A26-M-B19	1A	2.75	433
891	A26-M-B21	1A	3.5	509
892	A26-M-B32	1A	2.9	447
893	A26-M-B55	1A	3.46	530
894	A26-M-B62	1A	3.7	527
895	A26-M-B63	1A	3.73	531
896	A27-M-B19	1A	2.38	419
897	A27-M-B21	1A	3.25	495
898	A27-M-B32	1A	2.57	433
899	A27-M-B55	1A	3.18	516
900	A27-M-B62	1A	3.45	513
901	A27-M-B63	1A	3.48	517
902	A1-M-B19	1A	2.13	393
903	A1-M-B21	1A	3.04	469
904	A1-M-B32	1A	2.3	407
905	A11-M-B62	1A	3.02	473
906	A1-M-B55	1A	2.96	489
907	A1-M-B62	1A	3.25	487
908	A1-M-B63	1A	3.28	491
909	A28-M-B19	1A	1.64	351
910	A28-M-B21	1A	2.52	427
911	A28-M-B32	1A	1.79	365
912	A28-M-B55	1A	2.42	447
913	A28-M-B63	1A	3.1	449
914	A11-M-B19	1A	1.87	379
915	A11-M-B63	1A	3.03	477
916	A11-M-B21	1A	2.81	455
917	A14-M-B72	2	5.33	557

EXAMPLE 3

Preparation of A7-M-B6

##STR00133##

An isocyanate of formula (IX), wherein R^a corresponds to fragment B6 of table II, (0.3 mmol, 3 eq.) was added to a suspension of the resin of example 8 wherein R^c corresponds to the fragment A7 of table I (0.1 mmol, 1 eq.) in dry DCM (2.5 ml) and DIPEA (17.1 μl, 0.1 mmol, 1 eq.). The final suspension was shaken overnight at 25° C. in a reactor (Quest 210™ or Miniblocks™). The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml), MeOH (1 ml), water (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), MTBE (1 ml, 2 cycles) and then air dried. The Resin (0.1 mmol, 1 eq.) was suspended in a solution of TFA/DCM 1:1 (2 ml) and shaken for 2 h at 25° C. The solution phase was collected and the resin was rinsed with DCM (collected as well), and a second cycle was performed. The final washing was performed with MeOH. All the collected were dried under reduced pressure affording compound A7-M-B6 (see entry 937 of table V below).

LCMS (HPLC Method 1B): m/z 448 [M+H]⁺ @ r.t. 4.3 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 8.51 (s, 1H), 8.46 (s, 1H), 8.11 (t, J=5.6 Hz, 1H), 8.00 (d, J=5.0 Hz, 1H), 7.83 (d, J=1.7 Hz, 1H), 7.43 (d, J=8.9 Hz, 1H), 7.34-7.39 (m, 2H), 7.24 (dd, J=9.0, 2.0 Hz, 1H), 6.97 (s, 1H), 6.84-6.89 (m, 2H), 5.59-5.71 (m, 1H), 4.95-5.04 (m, 3H), 3.83 (dd, J=12.9, 4.0 Hz, 1H), 3.72 (s, 3H), 3.60-3.65 (m, 2H), 3.49 (dd, J=13.4, 5.2 Hz, 1H), 2.57-2.64 (m, 1H), 2.46-2.53 (m, 1H).

Following the procedure described in example 11 and by using any proper reactant as per the process of the invention, that is by supporting any suitable amine onto the resin, by preparing the carbamate derivative in position 8 of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety with any suitable isocyanate derivative and by finally carrying out resin cleavage, the following compounds of table V were also prepared.

TABLE V
		HPLC	HPLC
Entry	Compound	Method	tR (min)	[M + H]+
918	A2-M-B5	1B	3.16	469
919	A2-M-B6	1B	2.93	493
920	A2-M-B7	1B	3.14	491
921	A3-M-B5	1B	3.23	497
922	A3-M-B6	1B	2.99	521
923	A3-M-B7	1B	3.22	519
924	A4-M-B5	1B	4.6	442
925	A4-M-B6	1B	4.09	466
926	A4-M-B7	1B	4.57	464
927	A4-M-B8	1B	5.46	504
928	A5-M-B5	1B	5.66	488
929	A5-M-B6	1B	5.15	512
930	A5-M-B7	1B	5.61	510
931	A5-M-B8	1B	6.23	550
932	A6-M-B5	1B	5.63	454
933	A6-M-B6	1B	5.12	478
934	A6-M-B7	1B	5.58	476
935	A6-M-B8	1B	6.23	516
936	A7-M-B5	1B	4.84	424
937	A7-M-B6	1B	4.3	448
938	A7-M-B7	1B	4.8	446
939	A7-M-B8	1B	5.65	486
940	A8-M-B5	1B	3.26	469
941	A8-M-B7	1B	3.26	491
942	A9-M-B7	1B	3.36	497
943	A10-M-B5	1A	3.06	468
944	A10-M-B53	1A	2.75	454
945	A10-M-B56	1A	2.68	442
946	A10-M-B57	1A	1.86	400
947	A10-M-B58	1A	2.04	444
948	A13-M-B5	1A	3.13	426
949	A13-M-B53	1A	2.82	412
950	A13-M-B56	1A	2.74	400
951	A13-M-B57	1A	1.85	358
952	A13-M-B58	1A	2.05	402
953	A14-M-B5	1A	3.48	474
954	A14-M-B53	1A	3.21	460
955	A14-M-B56	1A	3.13	448
956	A14-M-B57	1A	2.26	406
957	A15-M-B5	1A	3.36	440
958	A15-M-B56	1A	2.97	414
959	A15-M-B57	1A	2.06	372
960	A16-M-B5	1A	3.43	452
961	A16-M-B53	1A	3.13	438
962	A16-M-B56	1A	3.06	426
963	A16-M-B57	1A	2.14	384
964	A16-M-B58	1A	2.33	428
965	A17-M-B5	1A	3.24	464
966	A17-M-B53	1A	2.94	450
967	A17-M-B56	1A	2.86	438
968	A17-M-B57	1A	2	396
969	A17-M-B58	1A	2.18	440
970	A18-M-B5	1A	3.61	488
971	A18-M-B53	1A	3.36	474
972	A18-M-B56	1A	3.31	462
973	A18-M-B57	1A	2.46	420
974	A18-M-B58	1A	2.57	464
975	A4-M-B53	1A	2.62	428
976	A4-M-B56	1A	2.52	416
977	A4-M-B57	1A	1.73	374
978	A19-M-B5	1A	2.97	412
979	A19-M-B53	1A	2.63	398
980	A19-M-B56	1A	2.56	386
981	A19-M-B57	1A	1.73	344
982	A19-M-B58	1A	1.92	388
983	A20-M-B5	1A	3.9	480
984	A20-M-B53	1A	3.68	466
985	A20-M-B56	1A	3.63	454
986	A20-M-B58	1A	2.96	456
987	A7-M-B53	1A	2.76	410
988	A7-M-B57	1A	1.81	356
989	A7-M-B58	1A	2.01	400
990	A21-M-B5	1A	3.58	492
991	A21-M-B53	1A	3.33	478
992	A21-M-B56	1A	3.24	466
993	A21-M-B57	1A	2.36	424
994	A21-M-B58	1A	2.55	468
995	A22-M-B5	1A	2.98	424
996	A22-M-B53	1A	2.65	410
997	A22-M-B56	1A	2.56	398
998	A22-M-B57	1A	1.74	356
999	A11-M-B53	1A	2.85	412
1000	A23-M-B5	1A	3.52	492
1001	A23-M-B53	1A	3.27	478
1002	A23-M-B56	1A	3.2	466
1003	A23-M-B57	1A	2.32	424
1004	A23-M-B58	1A	2.51	468
1005	A24-M-B5	1A	3.66	488
1006	A24-M-B53	1A	3.42	474
1007	A24-M-B57	1A	2.5	420
1008	A24-M-B58	1A	2.67	464
1009	A25-M-B5	1A	3.71	488
1010	A25-M-B53	1A	3.46	474
1011	A25-M-B56	1A	3.4	462
1012	A25-M-B57	1A	2.56	420
1013	A25-M-B58	1A	2.72	464
1014	A26-M-B5	1A	3.89	480
1015	A11-M-B56	1A	2.77	400
1016	A11-M-B57	1A	1.89	358
1017	A26-M-B53	1A	3.65	466
1018	A26-M-B56	1A	3.6	454
1019	A26-M-B57	1A	2.76	412
1020	A26-M-B58	1A	2.92	456
1021	A27-M-B5	1A	3.64	466
1022	A27-M-B53	1A	3.38	452
1023	A27-M-B56	1A	3.31	440
1024	A27-M-B57	1A	2.41	398
1025	A27-M-B58	1A	2.59	442
1026	A11-M-B58	1A	2.09	402
1027	A1-M-B5	1A	3.43	440
1028	A1-M-B53	1A	3.13	426
1029	A1-M-B56	1A	3.05	414
1030	A1-M-B57	1A	2.14	372
1031	A1-M-B58	1A	2.34	416
1032	A28-M-B5	1A	2.84	398
1033	A28-M-B53	1A	2.51	384
1034	A28-M-B57	1A	1.64	330
1035	A28-M-B58	1A	1.83	374
1036	A11-M-B5	1A	3.16	426
1037	A14-M-B73	2	4.53	482
1038	A14-M-B74	2	3.83	434

EXAMPLE 4

Preparation of A14-M-B76

##STR00134##

An aldehyde of formula (XIII, wherein R^a corresponds to the fragment B76 of table II, (1.0 mmol, 10 eq.) was added to a suspension of the resin of example 8 wherein R^c corresponds to the fragment A14 of table I (0.1 mmol, 1 eq.) in a dry mixture CH(OCH3)3/DMF/MeOH 9:1:2 (2 ml) and acetic acid (20 μl). The final suspension was shaken overnight at 25° C. in a reactor (Quest 210™ or Miniblocks™). The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml). The Resin (0.1 mmol, 1 eq.) was suspended in THF, NaCNBH₃ (314 mg, 5.0 mmol, 50 eq.) was added and the final suspension was shaken for 16 h at 25° C. The resin was washed sequentially with DMF (1 ml), DCM (1 ml), DMF (1 ml), DCM (1 ml), MeOH (1 ml), water (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), DCM (1 ml), MeOH (1 ml), MTBE (1 ml, 2 cycles) and then air dried. The Resin (0.1 mmol, 1 eq.) was suspended in a solution of TFA/DCM 1:1 (2 ml) and shaken for 2 h at 25° C. The solution phase was collected and the resin was rinsed with DCM (collected as well), and a second cycle was performed. The final washing was performed with MeOH. All the collected were dried under reduced pressure affording compound A14-M-B76 (see entry 1039 of table VI below).

LCMS (HPLC Method 2): m/z 517 [M+]⁺ @ r.t. 5.91 min. ¹H NMR (400 MHz, DMSO-d₆) δ ppm 8.40 (t, J=5.7 Hz, 2H), 7.87-8.04 (m, 2H), 7.27-7.33 (m, 2H), 7.01 (dd, J=7.6, 1.6 Hz, 3H), 4.88-5.08 (m, 2H), 4.38 (s, 3H), 4.06-4.26 ppm (m, 4H).

Following the procedure described in example 12 and by using any proper reactant as per the process of the invention, that is by supporting any suitable amine onto the resin, by preparing the amino derivative in position 8 of the 3,4-dihydro-2H-pyrazino[1,2-a]indol-1-one moiety with any suitable aldehyde derivative and by finally carrying out resin cleavage, the following compounds of table VI were also prepared.

TABLE VI
		HPLC	HPLC
Entry	Compound	Method	tR(min)	[M + H]+
1039	A14-M-B75	2	6.27	445
1040	A14-M-B76	2	5.91	517

Claims

1. A compound of formula (I)

2. A compound of formula (I) according to claim 1 wherein:

R1 is a group —NR^cR^d and R^c and R^d are both hydrogen atoms or one of them is a hydrogen atom and the remaining one of R^c or R^d is a straight or branched C₁-C₆ alkyl or C₂-C₆ alkenyl group or it is an optionally substituted aryl or arylalkyl group.

3. A compound of formula (I) according to any one of claim 1 or 2 wherein any of R^a, R^b, R^c and R^d is independently halogen, nitro, optionally substituted oxo groups (═O), carboxy, cyano, C₁-C₆ alkyl, polyfluorinated alkyl, C₂-C₆ alkenyl, C₂-C₆ alkynyl, cycloalkyl, cycloalkenyl, aryl, heterocyclyl, amino groups, carbonylamino groups or hydroxy groups.

4. A compound of formula (I) according to any one of claim 1 or 2 wherein R1 is a fragment denoted by any of codes A1-A28 and R is a fragment denoted by any of codes B1-B76

5. A process for preparing a compound of formula (I) as defined in claim 1 characterized in that the process comprises:

f) reacting a compound of formula (I):

6. A process according to claim 5, characterized in that the optional conversion of a compound of formula (I) into another compound of formula (I), is carried out by one or more of the following reactions:

g.1) acid or basic hydrolysis of a compound of formula (I) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, to give the corresponding compound of formula (I) wherein R1 is —OR^c and R^c is hydrogen, or the corresponding salt;

g.2) transesterification of a compound of formula (I) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl, by reactions with a compound of formula (XV):

R^c—OH  (XV)

to give the corresponding compound of formula (I) wherein R1 is —OR^c and R^c is a different C₁-C₆ alkyl;

g.3) aminolysis of a compound of formula (I) wherein R₁ is —OR^c and R^c is C₁-C₆ alkyl, by reaction with a compound of formula (XVI):

HNR^CR^d  (XVI)

to give the corresponding compound of formula (I) wherein R1 is —NR^cR^d;

g.4) esterification of a compound of formula (I) wherein R1 is a group —OH or its corresponding salt, by reactions with a compound of formula (XV) as defined above, to give the corresponding compound of formula (I) wherein R1 is —OR^c;

g.5) amidation of a compound of formula (I) wherein R1 is a group —OH or its corresponding salt, by reaction with a compound of formula (XVI) as defined above, to give the corresponding compound of formula (I) wherein R1 is —NR^cR^d.

7. A process for preparing a compound of formula (I) as defined in claim 1, or a pharmaceutically acceptable salt thereof, which process comprises:

i) hydrolyzing under acid or basic conditions the compound of formula (VII) wherein R1 is —OR^c and R^c is C₁-C₆ alkyl;

j) reacting the resultant acid derivative with a derivatized formyl polystyrenic resin of formula (XVII):

(P)—CH₂—NHR^c  (XVII)

wherein (P) is the resin and R^c is as defined in claim 1;

k) reacting of the resultant compound of formula (XVIII):

8. A library of two or more compounds of formula (I)

9. A library according to claim 8 wherein the compound has the formula:

10. The method according to claim 1 wherein the cancer is selected from the group consisting of carcinoma such as bladder, breast, colon, kidney, liver, lung, including small cell lung cancer, esophagus, gall-bladder, ovary, pancreas, stomach, cervix, thyroid, prostate, and skin, including squamous cell carcinoma; hematopoietic tumors of lymphoid lineage including leukaemia, acute lymphocytic leukaemia, acute lymphoblastic leukaemia, B-cell lymphoma, T-cell-lymphoma, Hodgkin's lymphoma, non-Hodgkin's lymphoma, hairy cell lymphoma and Burkitt's lymphoma; hematopoietic tumors of myeloid lineage, including acute and chronic myelogenous leukemias, myelodysplastic syndrome and promyelocytic leukaemia; tumors of mesenchymal origin, including fibrosarcoma and rhabdomyosarcoma; tumors of the central and peripheral nervous system, including astrocytoma, neuroblastoma, glioma and schwannomas; other tumors, including mesothelioma, melanoma, seminoma, teratocarcinoma, osteosarcoma, xeroderma pigmentosum, keratoxanthoma, thyroid follicular cancer and Kaposi's sarcoma.

11. An in vitro method for inhibiting protein kinase activity which comprises contacting the kinase with an effective amount of a compound of formula (I) as defined in claim 1.

12. A pharmaceutical composition comprising a therapeutically effective amount of a compound of formula (I) as defined in claim 1 and, at least, one pharmaceutically acceptable excipient, carrier and/or diluent.

13. A product or kit comprising a compound of formula (I) as defined in claim 1 or a pharmaceutical composition thereof as defined in claim 12, and one or more chemotherapeutic agents, as a combined preparation for simultaneous, separate or sequential use.

14. An intermediate of formula (VII):